Before this season, I thought the Celtics could be legitimate contenders if everyone is healthy for the playoffs, Jeff Green turned out to be a Sixth Man of the Year candidate coming off the bench in a different role that what he played in OKC, and Bradley and Johnson played well enough to be contributors in the rotation. Green's heart problem was mitigated somewhat by the lucky pickup of Pietrus, while the acquisition of Bass means that Johnson probably doesn't need to be a monster off the bench.
Right now, I think the best path is to commit to giving Bradley 15 minutes per game and hope he develops into a guy who earns keeping those minutes when it comes to the playoffs. If Bradley does that, everyone is healthy, no one slumps, and Wilcox overachieves, this team has a credible shot at another miracle playoff run.