Interesting... I would think a lot hinges on what direction this team takes next season. I don't see McHale linking himself to a potential "rebuilding" situation, which could be the case if a number of things play out (Pierce opts out, Ray leaves - but I doubt this).
The connection of McHale to Ainge gives this story credibility, and I really believe that he could succeed provided he gets a couple of solid assistants.
My gut tells me that Doc is done... I don't think he'll put himself through another grinding season, which is what next year will be should the same cast return. But in watching the '08 Finals game (ESPN Classic) the other day, it's apparent that this current Celtics team is not as good as those guys, with KG being the most notable. Whomever coaches this team will have a bit of a tough road ahead of him...