What would you do with a son who doesn't want to play basketball anymore?

He is not getting the playtime he thinks he should get. He is a very good player, but is not cracking the top five. He wants to complete this season and be done with it. He just wants to workout, work, and do school. I think athletics are good for him. I am torn. I might just make him play. What the heck does a teenage boy know about what is best for him. I am worried idle time will lead to bad things.