I think not rebuilding is the right move. Very likely if Perk hadn't hurt his leg, the C's would be hoisting banner #18 right now. I don't see why you blow that up, especially when your ability to actually blow it up is very much hampered right now by KG's contract. All blowing it up now would do would put us into mediocrity immediately, with little ability to improve until KG's contract. So why not give it one last go (or two) in the meantime?
Also, I think there's several very strong reasons to keep this team together:
1) KG might actually be better, not worse next year. Will he ever be the old KG again? No, but he looked better as the season went on and will likely get more mobility back.
2) While staying healthy all year is a long shot, thinking that we're going to successfully rebuild is an ever longer shot. Actually rebuilding into a fairly good playoff team is a 50/50 proposition. Rebuilding a contender is even harder. Even if we do rebuild into a contender, we're far more likely to be Miller's Pacers, Ewing's Knicks, Webber's Kings, or Malone's Jazz than Jordan's Bulls. So while the shots are long next year, they're far better than they are to actually rebuild a real champion.
3) What were the real roots of our loss? Depth. Add one more reliable wing and a healthy Perk, we likely don't run out of steam and win game 7. There's no reason we can't fill the backup win role with the MLE. If Wallace comes back, we're fine at the 4/5. If not, we can likely get a serviceable center who can play 10-15 mpg at the LLE (at this point, there's no reason BBD can't be the primary backup at the 4 and 5, logging 25+ mpg).