The problem they are not becoming yankified as much anymore.<quoted text>
If 2nd and 3rd generations have become Yankified, then what it is the problem?
People who grew up in Mexico cannot be expected to be fully gringified. So what? Leave them alone. Why is it your business which language someone speaks? I speak Castilian all the time, and whatchagonna?
Balkanized... the analogy doesn't work. The USA stole territory where Mexicans already lived. So... Mexican culture is part of the USA and there's nothing anyone can do about it, nor should they want to, since it's a benefit to the USA.
I like to be able to communicate with people in my country, share a common bond/allegiance and be able to trust them.
Why do you hate this country so much?