I think we should go for a partial rebuild.
Get a lottery pick - it gives us at least a minimal chance to get a #1 or #2 pick. We could pull a Chicago Bulls and luck out (ex Derrick Rose). Even if we don't win the sweepstakes, someone like Julius Randle, Harrison bros, etc would be a fine consolation.
A decent lottery pick might mean giving up Bradley, Sully...maybe even Rondo, if the right deal presents itself. With that, we shoot for the playoffs with what we have and ride it one last time.