I found it great how so many non-soccer fans chime in with opinions. Can the US win it all? of course. Is it likely? No.
Greece won Euro 04 basically playing Bunkerball. They won a competition that includes the best teams in Europe. Is the US better than Greece, oh god yes.
In the 2002 World Cup we were 2 games away from a Turkey vs. South Korea Final.
It all depends on who gets hot, and how they react.
Best case scenario:
US wins Group C, plays runner-up from Group D (avoids Germany). This could be any of the remaining teams: Ghana, Serbia, Australia. All teams that the US can beat.
They would then play the winner of A1 vs B2. Which would avoid Argentina. All of the teams yesterday looked beatable (France was a mess) And Greece/Nigeria/South Korea don't strike fear into anyone. So the US could easily make it into the semis.
The US got hot at the right moment in the Confed Cup. They beat Spain. People don't realize the magnitude of that. Spain has only lost once in the last FOUR years!!! and it was that game to USA.