I don't know about you guys, but I really feel that a healthy squad and just a couple decent bench players yields championship #18 next season. I think this year the playoffs have/are proving a lot of things:
1) The Rondo, Ray, Pierce, and Perk are very good. Without KG this team goes to 7 games in the semis against a team who almost swept Cleveland and is on the verge of beating them altogether. Add a healthy KG, a rested Ray and Paul, and a couple bench players, there's no reason to think they can't easily win it all next year.
2) Cleveland and Orlando both look very vulnerable. If Orlando needs 7 games to take a severely weakened C's squad, there's no way they can beat them with KG, a rested Big Two, and a bench. Similarly, if Cleveland is getting their butts handed to them by a team we could man-handle when healthy, Cleveland isn't really a match for us.
I don't think we need to epically improve next year. A solid legit big man, a solid backup wing, and our health and I think #18 happens. The backup PG spot isn't even the big deal it used to be, since Rondo is now fully capable (and young enough) to play 35-40 mpg. While I've been an Eddie basher at the point, I think we can now deal with him there for less than 10 mpg come playoff time.
Also, while I think a healthy team could challenge the Bulls' record for most regular season wins, we certainly don't have to make that push. If the C's just add a big and a swingman and the bench is a little weak, there's nothing to say that we can't simply limit the Big Three's minutes and just deal with losing a couple more games with the likes of Giddens and Walker getting some minutes. Even if they lose a couple extra games, I can't see them losing anymore than 20 games next season.
Overall, I don't think there's a ton of a reason to panic. Just add a couple players and keep our stars healthy.