Yup, all these different restaurants, and foods are indeed good, and I wouldn't have it any other way. However, all these restaurants and foods reflect the multi-ethnic make-up of our society. The problem arises when different ethnic groups maintain their cultural practices in a community where positive interaction relies on commonalities in order to establish unity. Language is one of those commonalities.
If we look at Europe, and cities like London, they are having major issues now because of their pro-multiculturalism policies. They are dealing with protests, not to mention daily conflict and tension between the various ethnic groups. It's too late now to undo what damage has been done. In the US for the most part, these issues are not present despite the US having more immigrants every year than any other country. The reason can be attributed to a melting pot approach which has been way more successful in assimilating newcomers than a pro-multiculturalism approach.
That's not true at all.
Europe is full of variant cultures, languages and ethnic groups that are and always have been, compared to us, closely packed. London (as well as Paris and lots of other places) has
long been full of foreigners, mini-cultures and ethnic pockets. Partly by virtue of their being large attractive cities, partly as a result of their history in international commerce and colonization. When I lived in Paris (35 years ago) I met and/or worked with people from Gemany, Italy, all over Scandinavia, central Europe, Spain, Poland, Australia and New Zealand, Maylasia, all over the Maghreb and the Middle East; west and south Africa, and a few other places; they ALL contributed and continue to contribute to the richness of the place. They come for education and opportunity and simply life enrichment.
England alone, small as it is, contains way more languages and semi-intelligible dialects of English than we can imagine here. And people all over Europe are regularly at trilingual and quadrilingual before they're even out of childhood. No, Europe has been multiethnic and multicultural for many
centuries, dude. And that makes it a lot more interesting and viscerally vibrant than, say, North America. As a result it's FAR more common to hear exotic languages, smell outlandish cooking, and see garb from far-flung places than it is here. And it's been that way really since before the Celts wandered in.