Argentina is also successful in this tournament as people were not expecting they will reach in the Finals, but they wrong us to be wrong..
Expect that they will improve next time as they will learn from their mistakes, they need to invest in players with size and the athleticism so they will be able to compete well with the Spain if they were lucky to be in the Finals again.
Olympics is a different story, it's more prestigious I guess, so I think USA will try to protect their streak of winning the championship.
They have already won 3 consecutive championship in the follower years.
2016 Rio , 2012 London and 2008 Beijing. http://www.iweblists.com/sports/olympics/summer/MensBasketball.html