Doc is Doc. Those who remember 2007 remember a coach that has a hard time settling on a rotation when the talent on the roster doesn't dictate it. In 2007 only when injuries destroyed the depth chart did the team ever get a stable rotation. I'm of the belief that guys need run to play well. Yes KG and PP need to be managed to stay fresh, but other guys need more minutes to play well.
In 2008 this was an obvious decision for him (starters were obvious, Posey as 6th man - obvious, once they had brown as first big - obvious.) The more difficult decisions (Powe or BBD, House or Cassel) he struggled with all year.
One idea that might help this team is to use Pierce off the bench (granted I have no idea if Pierce would be willing to do this). It would help get Green more minutes with Rondo (Green is not a primary creator) and give the first unit a better ability to run: Rondo, Lee, Green, Bass, KG could get up and down the floor. It would give the bench two creators in Terry and Pierce backing up the guard/wing spots - ensuring when Rondo is out the offense doesn't become stagnant. It would keep Pierce fresh by reducing his minutes.
Most importantly it might stabilize the minutes rotation as Pierce off the bench can play wing behind Lee & Green. Terry can play combo guard behind Lee / Rondo.
That's a solid 5 man rotation for those spots. Last step is that Doc needs to get his big man rotation in order. I'm against more than 5-10 minutes of small ball a game. I think Sullinger, Bass, and Wilcox are all serviceable at PF. Wilcox is not terrible at C, but not a great option either. The real problem with this team is a lack of depth behind KG at C. Hopefully Darko gets healthy and can play, but absent that the C's need to consider moving some of their superflous depth to get a C.
The rest of the depth behind the top 9 needs to be relegated to a real bench role.