There will be more "Mexicans" too, in a more third-worldish America. Book it.
The "Mexication" -- what? -- of the US population is happening as we speak. We're getting browner. Everyone needs to get over it. It ain't a tragedy.
(Yet. It's the bad ole whorl. Anything could happen.)
In my book, it's good for Americans to have contact with large numbers of predominantly Roman Catholic, work-motivated immigrants acquainted with traditions of parsimony and thrift, and the slightly spooky concept of action performed as sacrifice.
Even better if they stay. Teach us a goddam lesson about the value of our wages, at least. We could sure use it.