The patterns are different.
On the upper end of the scale, you have the so-called NYLON types, etc. who never really settle anywhere. They just keep bouncing around. But they typically know four or five different languages very, very well.
On the middle-to-low end of the scale, you have much larger groups who remain connected to the “old country” through internet, cheap phone, cheap travel and cable television. There’s really no desire to assimilate. A hundred years ago immigrants who were here were stuck here. Not so today.
It’s going to take at least two generations to produce full-fledged Americans.
I’ve heard the argument before. The fact is, the kids that I have encountered have ZERO desire to watch sabado gigante and the latest novela. The kids in question are/were in the lower middle income strata. Of course, I am extrapolating from folks I know/knew in Newark, Miami, and Chicago, but, even with all of the media, one cannot maintain the culture of “the old country” unless the move to the middle of nowhere or join some religious cult (see: the Hasidim, (ducks)).