The US and Canada are slowly developing the infrastructure of local teams that will eventually allow for Pro Rel to exist - but we are talking 60 years from now for this to become sustainable and given that 60 years ago the biggest sports in the US were boxing and horse racing, I wouldn't want to make that bet.
Biggest sport in Germany until the 1970's? Gymnastics.
Biggest sport in France in the 1930's? Cycling (still pretty big).
Times change.
MLS is a tough, physical league, that emphasizes speed, and features plastic fields, grueling travel, extreme weather, and incompetent refs. - NK Toronto