How can this be justified
I don't think coming out and saying "hey all you other countries with your unique histories and cultures, guess what, you're speaking English now" would go over very well. There are so many factors that make this implausible but they barely warrant discussion because the possibility of this dies with "people won't want to" before you even get into the headaches of getting it to work.
Why taking away diversity ?
We need diversity to develop so we are the ones who some how make these diversities we are known by our nationality,traditions and our culture and all these things come from our language so if we have English as our global language then nothing new is going to come to us.We are who we are and we are not going to let some one change it.
English will be a Co-language
It is entirely possible that English could become (and is in many instances) the language of world politics and trade. However, culture needs to be taken into account. Sure, the culture of the world is becoming more homogeneous, but that doesn't stop people from England, Texas, and Hawaii from being different. It just means that more people have things in common. I find it very hard to believe that people, with a heritage of being "different" would give up that difference without a fight. Look at the Cold War or even WWII. Countries that were taken over by other countries didn't lose their identity. In fact, many of the countries had corresponding spikes in their national identity in reaction to aggression. Therefore, as long as there is a threat of invasion or if there is competition between countries and cultures, other languages will continue to thrive. Until people quit wanting to be special, English will not become the world language. It may become the language of global transaction, but it will not become the one-and-only, high-flying language.
Besides, there are too many hipsters out there for the norm to stay the norm anyways.
It's too dificult
The problem with English is that there are too many rules and exceptions to the language. Pronunciation is usually not inconsistent with the spelling of the word ,even when removing the dialect aspect of every language. A language with a phonetic alphabet, be consistent, systematic and as far as numbers go, most places in the world, even japan, use the same numbers that are used in english.
Language is culture.
Many cultures are deeply rooted in language. If we tell the world that English is the global language then we are essentially telling the world. "You are different from me and I don't like it. Be like me." Also English is an incredibly difficult language to learn the basics of, never mind speak it fluently.
Diversity is Important
Making English the global language would never work. One of the things that makes human is our culture. Many people's language is the basis of their culture. Taking away their language is essentially telling them "You're different and we don't like it. Be like us." Also English is an incredibly difficult language to learn so even if it did become the global language many would only learn the basics ex (hi, bye, no, & yes). I don't like to generalize, but i assume many of the people on the yes side have never attempted to learn another language or are xenophobic.
English? One language?
No. English should not be a leading language as it is not the most popular language. Yes some people will say that it is an easy language to learn but I don't think that if you go out and say "Hey all of you are gong to speak English as a permanent language" I don't think that would go down very well! I'm Swedish so I could say that why don't we all speak Swedish? It's the same argument for every country in the world that has it's own language.
It's Not Traditiional
Here's the dealio, The United States of America is a country that is historically built on immigrants. Since Columbus in 1492, immigrants have been flooding the US, bringing in their own cultures and languages. Even today, America have been experiencing an immigration wave from Mexico. So should English be the official language of the US? No, its not the American way. Live Long Obama!
Disgrace to cultures, kids, countries, etc.
I don't tink english should be a world language because it is a disgrace to the other languages. As you know, language describes our culture and our country. I know many families that came to America 4 or 5 years ago that spoke Tibetan very well but now, all they Speak is English everywhere they go. Parents stiil may speak the language they were born with but think about their kids. They're going to grow in a community where everyone is speaking english and they're going to get influence by it. It is also important to be bilingual, trilingual, etc. I'm a 7th grader who is proud to call herself a Tibetan because I know English and Tibetan, a bilingual.
How would you like it?
Although it would be easier to communicate with people of other nationalities, LANGUAGE is part of our cultures!! I think that you must see this argument in multiple perspectives. Let's say that you speak YOUR language from YOUR country and YOUR culture, and only that. Would you like to learn a whole new language, a language that is known as the most difficult language to learn because it has so many slangs and complicated word forms (such as homophones)? Probably not.
There are two competing drives to take into account: the pressure for international intelligibility, and the pressure to preserve national identity. It is possible that a natural balance may be achieved between the two, but it should also be recognized that the historical loyalties of British ex-colonies have been largely replaced by pragmatic utilitarian reasoning.
The very dominance of an outside language or culture can lead to a backlash or reaction against it. People do not take kindly to having a language imposed on them, whatever advantage and value that language may bring to them. As long ago as 1908, Mahatma Gandhi said, in the context of colonial India: �To give millions a knowledge of English is to enslave them�. Although most former British colonies retained English as an official language after independence, some (e.g. Tanzania, Kenya, Malaysia) later deliberately rejected the old colonial language as a legacy of oppression and subjugation, disestablishing English as even a joint official language. Even today, there is a certain amount of resentment in some countries towards the cultural dominance of English, and particularly of the USA.
As has been discussed, there is a close link between language and power. The USA, with its huge dominance in economic, technical and cultural terms, is the driving force behind English in the world today. However, if the USA were to lose its position of economic and technical dominance, then the �language loyalties� of other countries may well shift to the new dominant power. Currently, perhaps the only possible candidate for such a replacement would be China, but it is not that difficult to imagine circumstances in which it could happen.
A change in population (and population growth) trends may prove to be an influential factor. The increasing Hispanic population of the USA has, in the opinion of some commentators, already begun a dilution of the �Englishness� of the country, which may in turn have repercussions for the status of the English language abroad. Hispanic and Latino Americans have accounted for almost half of America�s population growth in recent years, and their share of the population is expected to increase from about 16% today to around 30% by 2050. Some even see the future possibility of a credible secessionist movement, similar to that for an independent Quebec in Canada, and there has been movements within the US Republican party (variously called "English First" or "Official English" or "US English") to make English the nation�s official language in an attempt to reduce the significance of Spanish. Official policies of bilingualism or multilingualism in countries with large minority language groups, such as are in place in countries like Canada, Belgium and Switzerland, are an expensive option and fraught with political difficulties, which the USA would prefer to avoid.
A 2006 report by the British Council suggests that the number of people learning English is likely to continue to increase over the next 10-15 years, peaking at around 2 billion, after which a decline is predicted. Various attempts have been made to develop a simpler "controlled" English language suitable for international usage (e.g. Basic English, Plain English, Globish, International English, Special English, Essential World English, etc). Increasingly, the long-term future of English as a global language probably lies in the hands of Asia, and especially the huge populations of India and China.
Having said that, though, there may now be a critical mass of English speakers throughout the world which may make its continued growth impossible to stop or even slow. There are no comparable historical precedents on which to base predictions, but it well may be that the emergence of English as a global language is a unique, even an irreversible, event.