I don't think it's all on Doc. I think it's Doc in combination with the current healthy roster. Two years ago, Doc motivated his team with the theory of Ubuntu. That roster was led by KG who is super motivated and bought in 100%. Makes life a lot easier as a coach when your best player buys into what you are trying to do.
Now KG has been out and away from the team during games. With Pierce hurt, and Allen more of a quiet, lead by example type, the one constant has been Sheed. If Rasheed Wallace is your veteran presence, that's a major problem. Over the past few years, he has had a well-earned reputation for coasting through the regular season, then trying to turn it on in the playoffs. He's as concerned with winning arguments with officials as he is with winning games.
The return of KG should hopefully get this team back on track.