Nonsense. Even this article, which *you* posted but apparently didn't read or comprehend, specificly says that they have to go back home to Mexico to collect their money.
HINT: that's an *incentive* to return to Mexico.
Not at all. Should be no problem to get the money there, and reroute it here. BofA, Wells Fargo, and Western Union will all be quite aggressive at making that happen. For a fee, of course.