Hi Newforspeed
Welcome to the forums. Anyone with some knowledge of English can tell that you didn't write your questions yourself. Someone else did that for you, but I'll give you some answers anyway.
1. There were only 4.5 million speakers of English in Shakespeare's day. There are three major reasons for English having become what it is.
One: The British exported their language in the colonial days. (Some other languages got exported as well.)
Two: By the time English was taken overseas, it had become extremely simple structurally. Of the languages I have studied and of whose grammar I have some knowledge, English is by far the simplest. This makes it easy for nonnatives to acquire a working knowledge of English even though mastering the language is just as difficult as it is to master any other language. (The only problem is the inconsistent spelling.)
Three: About 100 years ago, the economic rise of the USA began and that contributed to making English number one. It gradually replaced French and Spanish in the western world. These two languages had been more important than English in the 19th century. In Finnish schools English 'dethroned' German in the 1950s, by the way. French remains an important language in diplomacy.
2. Not in the foreseeable future.
3. Economic growth does not depend on language. China has had massive economic growth for years and few Chinese speak English.
4. To some extent, yes. Not all minor cultures will disappear, though.
5. No. The natives will understand each other as well as they do now and the rest of the world will understand each other as well - or badly - as they do now. Many Brits don't undertand other Brits at the moment.
6. Languages have come and gone before. I can't see why English should be blamed for the disappearance of languages. Many languages die out owing to a lack of speakers, not because these people start to speak English all of a sudden.
7. Not any more than whatever has been a 'danger' before. All living languages have always changed. Nothing living remains constant for hundreds of years. A language that changes is not in danger. Language can take care of itself. For example, in Old English there was only one relative pronoun. That wasn't enough, so other relatives developed. Change doesn't always simplify a language.
8. ?
9. The Internet is one of the factors that promote the use of English.
10. No doubt many native speakers of English delight in the fact that their language is the lingua franca. We have nothing to worry about because of that. Every other English-speaking stranger I talk to has an inferiority complex due to his nonexistent command of other languages.
11. It is neither.
12. I wouldn't call it a danger. It's an inevitability that all languages have always faced and will always face. Nothing lasts forever. We need not worry about that, though, it's too far in the future.
13. No.
14. I wouldn't rate a scholar very high just because he speaks English. A writer who writes in English has a larger audience than one who writes in a small language and therefore he stands a better chance of being recognised. He is more likely to get rich and become famous than other writers.
15. I don't think all nations will want to have just one officia language in the EU.
16. Yes, in the foreseeable future. I think it will have lost some of its importance by the year 5275.
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17. It makes sense to teach languages. One of the consequences is the fact that there will be more multilingual people. The more languages people speak, the better they understand one another and foreign cultures.
18. English doesn't enrich my country's culture in the least. English is just a language like many others, it's not a danger.
19. It's understandable that Brits, Americans and Australians - New Zealanders as well - don't want to spend time learning foreign languages as much as the rest of the world. The teaching of foreign languages is often of abysmal quality in those countries; in some cases the pupils have a better knowledge of the target language than the teacher! One might think that the English-speaking countries would do very well in tests measuring, say, mathematical skills because they don't 'waste' time learning languages. They can devote more time to science in schools.
Cheers
CB