Other points:
Strict EU requirements to get a visa to play football there will serve as an Immigration wall to most Americans and Africans.
Still the vast majority of players who don't get national team caps are basically stranded here.
But the Africans get an easier shot at playing in Europe and more specifically England because so many of them hold European passports because the fucking French tried to conquer the world at one point and made most of Africa French territories.
I honestly think a strike if it happens will be the end of MLS. The NHL was obliterated off the map with their lockout and most would argue it was a "major" sport before that. Something similar in MLS... oh my.