As has been said by others, we have guys who would be valuable rotation players at the 3 but not championship caliber players, especially considering we have no stars.
Now that I've been able to see the NCAA tourney, my dream scenario is for Ainge to trade whatever number of draft choices/expendable resources he has to to get the 4th and 8th picks (or better) this year, and grab Justise Winslow and Willie Cauley-Stein.
We would have one of the best young defensive cores the league has ever seen. If we approached free agency with that group, we could probably convince an elite power forward to jump on the bandwagon.