"By your own reasoning, they would be killing the goose that lays them the golden eggs. People in their OWN economy can't generate those funds, and they know it."
I think this proves my point. Because of the rampant corruption Mexico is backed into a corner, they need this money to stay solvent, and the migration push accomplishes two things, it rids Mexico of the obligation to provide a decent economy for it's people, and it satisfies the the peoples revenge feelings for the loss of teritory to the U.S.
You are correct that in the end "Reconquista" would not solve their problem, (it would more than likely make it worse) the only thing that would solve Mexico's problem is a giant house cleaning. But I don't see hell freezing over any time soon.
"But I don't see hell freezing over any time soon."
If we toss back the ones who have snuck up here, in many cases risking their lives in order to work to make a better life for their families, THESE are the people who would have the best chance of making changes down there.
Now, if you are poor down there, but have ambition and are not afraid of work, your best bet is to try to come up here - take that away and they just might stay home and make things better in Mexico.