I say yes, but not so much to address depth on this year's club as to make the most of limited abilities to add to next year's roster.
As far as I can tell from Hoopshype/Shampsorts, next year we will only have 6 players under guaranteed contracts: Pierce, KG, Perkins, Wallace, Davis, and Rondo, plus options for Walker and Hudson.
Ray Allen could be signed to a new deal thanks to Bird Rights. Let's assume negotiations go well, and he is brought back. That makes 7 rotation players returning.
We will need to rely on the MLE and minimum salaries to round out the rest of the roster, which will be a tall order. [We will not have the LLE, aka the Bi-Annual exception, as we used it this year to sign Daniels.]
It's possible we could bring back players like House and Daniels with the maximum allowable raises (thus preserving the MLE), but both are under contracts that are well under their current market value. The success of this year's team may price these guys out of our range, making it difficult to retain one, if not both, without expending a good portion of the MLE.
I think this is why we may need to trade some of our expiring deals for a rotation-caliber player, even only if it is for a backup.