If we win 18 this year, we keep the big 3 intact and go for 19. It is not even a discussion to trade any of them in that event.
Also, alot will depend on the end of the 09/10 season, to see how teams get reconstituted if LBJ, Wade, Stoudemire and/or Bosh go into FA. There could be some major re-allignment, which could actually help the Celtics to eek out one more title. Say the big 3 are still healthy and productive. I would be more worried about the current Cleveland team, than an LBJ-led NY Knicks team, even if he had Bosh as his team-mate, just because it would be a new team with a lot of unknowns regarding chemistry. Yes, our new big-3 experiment worked in spades the first season, but that is more the exception than the rule.