Yeah, I'm sure you would have said that when the English, Germans, and Irish were coming over. Oh wait, no you wouldn't have.
The English were the founding culture of America. The Germans and Irish both assimilated relatively quickly. The same should be expected of every other cultural group, aside from of course Native Americans.
And that is happening with every cultural group in America today, including Hispanics. Many don't even know how to speak Spanish!
The irony is the article this that started the thread is even proof of this. The writer's point was that he was so assimilated he barely even identified as Hispanic before Trump.