I think modern NBA history tells us that if RJ keeps putting up decent numbers, at the very least he'll have trade value.
Washington is asking for 2 firsts for Kuzma, which probably means his value is around what we gave up for Poeltl (they too were pretending to insist on 2 firsts but ultimately happy to settle for one top 6 protected first from a team without a top 20 guy and some 2nds). And RJ is younger and less of an idiot than Kuzma, only makes like 6-7M more a year.
So, I'd guess that if RJ can keep this up, even while playing fairly bad defence, we've gone from getting Quickley, #31 and an overpaid guy for OG to getting a Quickley, couple of firsts and #31 for OG.
Wouldn't shock me if some team that has struggled to find wings like Memphis would send us a quality pick and bad money to get him, or a team with little at the 3 like Cleveland (maybe we're the 3rd team in a Donovan Mitchell deal since Cleveland would rather have a young starting 3 like Barrett than one or two of the picks being sent back) or even Sacramento which has to get some more talent at forward at some point, even if RJ isn't the most logical fit. Utah maybe too, if Ainge gets antsy and likes him as a 3 to complete a frontcourt of Barrett-Markannen-Kessler with Hendricks and Collins off the bench, sending us a first and using their other firsts to go after a guard. Or Portland, which will have no 3s once they trade Jerami Grant.