For next season we either try to win or go for a full rebuild
See I don't agree with this. Countless franchises have gone from the dregs to contenders without taking dynamite to the existing roster and going the Philly route.
I may get blasted for this, but what if Ainge feels a collection of Rondo,Bradley,Smart,Green,Young is capable of holding down the 1-2-3(positions, not best players on team) of a contender, eventually? To cast Rondo and Green off for scraps when it's really just the 4-5 that needs an upgrade would be hasty and I think dangerous to the future of the team. I realize based off of how I know you feel about Rondo and Olynyk that we probably won't see eye to eye on this.
Edit: And for clarity, when I say "upgrade" to the 4 or 5, I mean "bring in a megastar" upgrade, somehow.