Suz, you make a cogent point. Mexicans who flee now will make a life much more easily than the latecomers.
Other Freepers have pointed out the profound consequences to the Mexican economy and society due to the mass repatriation of Mexicans.
Early adopters will see their dollar/peso go farther.
These Mexicans have a taste of Western Civilization. They have the potential to destabilize that corrupt regime.
Another country that wins due to Trump.
The problem being that the revolution is as likely to lead to a Marxist state as a free state.