The depth of US basketball is phenomenal. The only thing the US might lack is a bit of chemistry compared to other teams, but talent wise I can't see any country coming close. Even teams like China that train and prepare months in advance for the Olympics tend to struggle- I watched the latest 3 game series of Australia's B team against China and China were very disappointing. Fundamentally they are solid, accurate shooters, disciplined etc. but as soon as Australia started applying full court pressure and hustling their guards they fell apart with turnovers etc. I do expect China to improve a lot between now and the Olympics though but if any team other than the US were to win it'd be a European team like Spain, Lithuania or Serbia. Australia has quite a few NBA players but they are all bench/role players and similar to the US they'll be lacking chemistry with nowhere near the same amount of talent.