With or without the training, attention and dedication an athlete can invest in a sport, if there is no passion, it won't be anough. Non-Latino Americans have just recently in the past decade catched the soccer "fever" where as to us Latinos soccer is the sport you like. Of course there are exceptions.
My parents signed up my 9 year old brother in a soccer team, and the only part he liked about it was the uniform and the food at practices. I personally would take him to practice, buy him different work-out clothes, left my job earlier to help him (i love soccer), even thought about volunteering to coach his team. But when i noticed it really wasn't his thing, I gave it up.
Not until recently dou you actually see little league soccer teams at parks. My other brother (he is 17 years old now and i'm 5 years older than him) was in a baseball team and i well remember his practices, and there were no soccer teams around, despite the fact that we lived in a latino community. The sport had not reached the "popularity" level it now has.
Exceptions, yes, my father and my little brother. I love soccer, playing it, and watching it on tv. My dad only likes the World Cup, and my brother only likes kicking the ball back and forth.
Hopefully with the Beckham arrival to the U.S. the sport gains much needed attention from new players, kids, and team sponsors to spread soccer arround. If Beckham is not gonna win with the Galaxy, the least he can do is spread the sport's popularity around.