The big problem I see is that I think that $200,000 figure being thrown around would have been a lock/near lock if he returned for one more year. I just don't think he's good enough for the Euro leagues that can afford to pay.
A real-life job after graduating college would pay as much as D-league, so his decision is a poor one in my opinion, but I'm not his mommy or his agent, so my opinion means nothing to him. Good luck to him.
As Foad pointed out, he's not without options should a playing career flame out, but I'd like to add that getting a coaching job without a degree is nearly impossible, so he's going to have to go back to school anyway if that's what he wants to do.