It didn't take the cubans long to figure out an alternative way into the country:

Cubans Flood Mexico in Bid to Reach U.S. - WSJ

Doesn't a story like this, in and of itself attest to the vulnerability of the Mexican open door into the USA.

We have transitioned from the melting pot to the American soup kitchen.....c'mon in the food and benefits and free and best of all no papers required.