Absolutely.
If you don't think they are the players they used to be, then you can always offer them a reduced role - and it's up to them whether or not they accept.
These guys are all-time greats and proven winners who can undoubtedly contribute to a team. Retooling and keeping Pierce/KG don't necessarilly need to be mutually exclusive.
Either way I sure as hell would not tank / rebuild. We have too much talent and trade bait on this roster to go into tanking mode. If you want to make major changes then you retool - keep your key pieces, ditch the pieces that aren't performing, shake things up a bit, and I think that's what will happen regardless of whether or not Pierce and KG return.
First think I'd do is hold on to the guys who have performed well in this playoff series because you already know you can trust these guys on the big stage. Brandon Bass, Jeff Green, Jason Terry, Terrence Williams.
Then you bring back Avery Bradley because even though he struggled this post season, it wasn't his fault - he strugled because he was forced to play out of position. He proved in last years playoffs that he can be a major contributer on the big stage, and his performance tonight was insiring.
Next, obviously, you bring back Rajon Rondo. He may be questional in the regular season, but in the playoffs he is a superstar.
Next you bring back Jared Sullinger - after only a couple of months as a pro he was making a huge impact on this team on both ends of the floor, and he's the dominant rebounder and hustle guy that we desperately need.
So this gives us the following starting lineup:
C - [To be decided]
PF - Brandon Bass
SF - Jeff Green
SG - Avery Bradley
PG - Rajon Rondo
Plus the following bench:
F - Jared Sullinger
G/F - Terrence Williams
G - Jason Terry
That is already a VERY solid 7 man roster, with a defensvely dominant starting lineup and a very solid bench.
Now you just need to fill another 5 or 6 spots. To do this you have trade chips (Crawford, Lee, Fab, Wilcox) along with the $20M that will come off the books when Pierce and KG leave
Use a good portion of that $20M to sign a legitimate starting center - Tiago Splitter, Nikola Pekovic, Al Jefferson. I've been against Jefferson up until now, but if Pierce and KG go he could be a perfect compliment for Bass up front.
Next you use the remainder of that space to sign a legit scoring guard - Monta Ellis, Tyreke Evans, OJ Mayo, JR Smith (much as I dislike him), Jarret Jack, JJ Redick, Kevin Martin...plenty of capable scorers out there that would fit the team, and some of those would sign for fairly modest money.
Then you use remaining cap space (if any), exceptions and existing trade chips to bring in...
1. A legit backup PG (Jose Calderon, Kirk Heinrich, Jason Kidd, Chris Duhon, Greivis Vasques, Andre Miller, Beno Udrih).
2. A backup Center (Chris Kaman,
3. A backup swingman (Stephen Jackson, Matt Barnes)
Suddenly you have a roster like this (example):
C: Al Jefferson
PF: Brandon Bass
SF: Jeff Green
SG: Avery Bradley
PG: Rajon Rondo
-
C: Chris Kaman
PF: Jared Sullinger
SF: Matt Barnes
SG: Jason Terry
PG: Jarett Jack
PG/SG/SF: Terrence Williams
Then fill out the rest of the roster with vet-min role players and maybe bring back Wilcox and Randolf as end of bench bigs.
Something like the above is not too far fetched, so even if we did lose Pierce and KG there is no reason why we couldn't still be very competitive.