OneOnOne, I agree that if Doc adopted the "Popovich plays all players" strategy, then eventually we probably could be a much better team with who we have (or by adding to the core). Like you said, Doc is a major impediment to that philosophy though.
Over time, by relying on "other" players, it builds their confidence and you get solid contributions from them thus relieving some of the burden off Pierce and KG. But you have to commit to it which is Doc's shortcoming. In addition, if the Celtics refuse to carry a big other than KG who can contribute or a PG to run the team or a rebounder, then all bets are off.
So, IMO, since it doesn't appear that Doc is going to relent, maybe it's time we move those guys. The Celtics are not better without PP and KG than they are with them.......BUT. I believe the Celtics CAN get more players who, collectively, bring more than what PP and KG can bring.
By removing PP and KG (and maybe JT, BB and CL) and adding O.J. Mayo (for JT), Bledsoe, Jordan (KG for Bledsoe & Jordan), Gasol (PP for Gasol), I think the Celtics will be just fine now and better in another 2-3 years and well into the future than if they held onto them. You will add those guys to Rondo, AB, JG and Sully and I think you have a great core for years to come. And with Gasol coming off the books, we can look to re-sign him or have some cap space to sign someone else.
JG is currently doing what PP is doing and possibly can do it even more efficiently if given the opportunity. Jordan and Gasol can do what KG does and even more. Then you add a 2 guard in someone like Mayo and Bledsoe who can do more than any of our current 2 guards can do. Collectively, we're building a better team, all around.