You can beat lesser team, yes. But I don't believe that Belgium has ever won the cup. I don't think that this will be their year either.
USA was not close to playing at Belgium's level today (except for the goalie). Unless we got lucky, it was just a matter of time until one of the incessant attacks resulted in a goal. Without Howard's heroics, the score could easily have been 5-1. Belgium could attack at will.
As far as USA development of forwards and midfielders, have we produced one that matched any on Belgium's teams? I doubt we've produced any that come close to Belgium's better forwards and midfielders.