He's apparently out in Houston, possibly due to his own wishes. The New York Post says he's walking away from coaching for a while, while ESPN has him seeing the writing on the wall and fleeing Houston as the franchise transitions from Carroll Dawson to economist Daryl Morey at GM.
Big name? Check. Defensive minded? Check. Championship caliber? Check. If he does leave, it would be highly surprising if the Maloofs didn't call him.