On a personal note, this is something that is far more alarming that is happening to my schools (and probably yours as well) - the dilution of your national identity is far more serious than a Yoga class at school, and very few people have the balls to even discuss such an issue.http://www.telegraph.co.uk/education/ed ... guage.html
Everywhere, it seems, there is and has always been alarm over immigrants. It's probably not as bad in the U.S., simply because it's such an amalgamation of ethnicities, with no one being the majority. (Although English is the primary spoken language, people of English or British descent comprise only a small percentage of the population at this point.) Lots of people, of course, are upset over Hispanic immigrants who continue to speak Spanish. (Some of these upset people protest at demonstrations with signs that show that they themselves don't know English.)
Anybody over a certain age in the U.S. remembers a band leader named Lawrence Welk, who had a television show. Lawrence Welk was born in a remote part of the Dakotas where everyone was a German immigrant, and he spoke only German until he was 18 when he set out in the big wide world. But it was obvious he thought of himself as an American.
That's how it works here. I can't claim to know how it works elsewhere, but it's hard to imagine that a child educated in public schools, exposed to the prevailing language, exposed to the prevailing culture, isn't going to grow up to identify as a national of the country and to take on most of the characteristics, both good and bad.