Every time the World Cup comes around there is talk that the sport is really going to take off in the US now. It's never happened. MLS has a small hardcore following here of course, but there is not a player in the MLS who wouldn't jump at playing in La Liga or Italian Serie A or the EPL. And on the flip side, MLS gets the stars who have aged out of playing in those leagues - Messi as an example.

MLS is pretty popular.