By all reports it sounds like Doc hasnt really worn out his welcome with the Celtics organization over all this. Multiple people have reported that Ainge would welcome back Doc back.
The harddest part for Doc? Will the team feel the same way. You can't go into a locker room preeching Ubuntu and togetherness when you were very publicly trying to give up on your players. I don't think Doc can go back to that, no matter how much respect the veterans have for him.
In terms of the fans, we'd probably get over it pretty quickly if the team is winning. If we are a .500 team, whats the point of wasting 7 million dollars a year on your coach. As a diehard Celtic fan, I could careless if Doc comes back or goes, I just want a competitive basketball team next year if we decide to run it back. However I'm more than okay with blowing this team up and watching some young and exciting basketball while we suck for a couple years.