So maybe we've been thinking about this the wrong way. Instead of worrying about Mexicans invading America, maybe what we need is for the United States to annex Mexico.
He is not suggesting that it happens right away, but that at least the paving of the path should begin:
Oh, we don't need to turn Mexico into a state, or several. At least not right away. But as part of any immigration deal, the United States needs to demand reform in Mexico. Serious political reform, and serious economic reform.
And reciprocity. If we're going to make it easy for Mexicans to come to the United States to live, work, hold property, and get public benefits without too much paperwork trouble, we need to make it easy for Americans to do the same in Mexico. Right now, as several people have noticed, the environment there is considerably less friendly to foreigners than America's is.
My own thoughts were mostly concerned with what should be done on the USAv2 side as a prelude to USAv3, but work would need to be done on the Mexico side to prepare as well. This might make for an interesting application of near-domestic PNM theory, but I will have to think on that for awhile.