If the USA continues to develop it's interest in football, or should I say soccer, then by the next world cup we could very well see them going all the way. A few years ago they were nowhere in the world of international football, now they can count themselves among the best in the world.
The simple fact that they have a population of 318 million means they have to be able to find 20 or so brilliant players. Compare that to Germany with a population of 80 million or Belgium with a mere 11 million.
The numbers are in their favour.