Yet very complicated. People like simplicity. I can take all the girls, mothers, grandmas, and explain them soccer (self-explanatory), but I can't do the same thing with football.
All sports have that, in boxing we have the feeling out round, same in MMA, same in soccer, same in basketball (Popovich and others experiment a lot).
I don't think soccer really wants/need America. It's already great as is. However, for monetary reasons they might want it (but that's a political debate i.e. american dollar). But as for being popular, soccer doesn't need America.