I trust that Doc is fundamentally a good and honest man, or at least as good and honest as you will see coaching in the NBA. The anti-Larry Brown. *IF* he walks away from the C's, it'll be because he does want to spend time with his family, wants to see his kid play ball, wants to take a little time off before he completely burns out.
Every coach in the league, when they leave a job, claims it's to spend more time with their family; after watching Doc for what, six years now, I trust that he really means that.
Doc's got a cushy gig all lined up at TNT whenever he wants it, they'll make room for him in the booth. I'd wager Jeff Van Gundy's employed somewhere next fall, anyway. He'll slide into JVG's seat, do color commentary on some games... take time off to see his kids play, recharge his batteries, and in a years' time start looking for another opportunity to coach.
Doc's either coaching the C's in the fall, or he's working for TNT part-time. Not a chance in hell he's coaching anywhere else next season.
Maybe, if he does step down, he can come back and be the third man in the booth at a couple C's games... take Cooz' spot, maybe when the C's are playing down in Florida.