I can agree on that, Americans have by far the longest bench, and that could really make the difference when for other nations 2nd teams are on the floor, that is opportunity i see for Americans to win this. But we also saw that players like Jokic can play crazy minutes, like he did in last NBA playoffs.
But considering in previous years i would be 100% certain that Americans are getting gold and winning every game with 20-30 pts difference, this time i am not so sure, i think that Serbia is legitimate contender for world title, if they stay healthy and they don't loose anyone else beside Teodosic.
And who knows, maybe even Greece can upset Americans again, none thought that was possible the last time

As far as I am concerned, I give the United States a 90% probability of winning this edition of the world cup. Apart from them, I would give the maximum chances to Serbia and then Spain. I don't think that Greece will be able to make it to the semi-finals on 13th September. Greece has some star players, but as seen from yesterday's match, as a team Serbia plays better. And I heard that a second Greek player has received injury after Kostas Sloukas. Giannis Athinaiou received a knee injury during yesterday's match, and may miss some of the world cup matches.