I think that a lot of it is going to depend on how well we do this year, both on the court and recruiting. I think if we do really well on the court (say a second straight final-four) he could easily call it quits. On the other hand, if we recruit really well, I think he's also more likely to call it quits. He's too proud of a man to leave behind an empty cupboard for his successor.
But then again, I could also see him coaching another 5-10 years just because. I think it says something about the man that we don't know what he'll do, but we feel pretty certain that it won't be what the world expects him to.