“Given the opportunity to flee the madness of Mexico, is there really a limit as to how many Mexicans would want to come to the United States?”
Not more than about 93,000,000.
You have struck upon the gem of a brilliant idea. We let all the Mexicans come north, which suits the liberals to a "T", as it gives them an endless supply of victims and welfare cases to vote them into absolute power forever.
We conservatives move south and take over Mexico, establishing our Grand Republic again. We build a GIANT heavily armored border wall to keep the libs out, tweak the good old American Constitution to absolutely preclude socialism in any form, reinforce the Second Amendment to preclude anyone from ever even considering taking our guns, and presto!!!
We live in peace, freedom and happiness again. And the climate is better, if you can stand the heat. Then we'll see once and for all, in a "laboratory setting", which system is the most effective - capitalist or Socialist.