I tend to agree with the contingent that says that while it'd be nice to trade Bass for a quality center, I'm not quite sure it's going to happen. People talk about pairing him with Lee, but together they make about 10 million a year for this season and the next two (and Lee has an additional year after that). I'm not sure how many teams want to take that on.
I'm actually OK with Sully and Wilcox manning the 4 if the C's do manage to pull it off. Assuming we traded Bass in a deal for a center, in the event that Wilcox went down again, we'd have the option of sliding Garnett back to the 4 to play alongside the new center, at least part of the time. And Green can certainly play some 4 minutes.
But again, I'm not sure how exactly we pull such a deal off, especially for a center who is actually an upgrade over Collins, who isn't great, but at least plays good defense.