This wouldn't be the case if Howard were available (and actually interested in become a Celtic), but as it stands, the free agency pool is just bone dry with no real talent that you can start a rebuild around.
On top of that, it is apparent, and was even recently stated by Ainge that beyond their play during games, KG, Ray, and PP have a dramatic effect on young players and how they handle their business. They bring a level of professionalism and effort that is contagious throughout the entire organization. KG alone holds an accountability to everyone that can't be duplicated.
Bring them and other role players back on one year deals, hope we can stay healthy, and go 10-12 deep ala Spurs (bench: Wilcox, Green, Dooling, Pietrus, JJJ, Greg, Hollins, Daniels) and play the Big 3 on limited minutes and keep everyone healthy for one last run before we go after Josh Smith in free agency in 2013.