I'm currently at a workshop in Lausanne, Switzerland and one of the lecturers is Dorothee Kern from Brandeis University. She was point guard in the East German National Basketball team in the 1980s and has kept playing, leading the German National Over-45s to winning the world championships this year. I asked her about the USA team. Given that they're so good at college, how did they do? Dorothee answered that they didn't even have a team.
This is sad, but jives with my experience of adults doing sports in the USA. They are active at school, jamming the soccer fields with kids playing soccer under the adoring eyes of parents, but by the age of 20 everything has stopped. Inactivity, indolence, unhealthy obesity.
The next Master's World Basketball championships is in Orlando, sponsored by ESPN. Maybe the USA won;t have a team there, either?