If I was running the team, I would keep him for a couple of reasons, unless he was causing behind the scenes problems and the contract demand was outrageous AND we had a great offer.
BUT, barring all of what I just said, which is improbable, I would hang onto him partly because I would work as an over the cap team, keep Saric, Carter and try hard to keep Baynes, and THEN use the MLE.
If Sarver decides to shave money by dealing Oubre for a lot less of a contract, and lets Baynes go, and spends around the salary floor, that will be disappointing. I am not sure how many roster spots that would leave open, but we'd then likely have a lot of minimum contracts. Though maybe we'd be further under the cap than the floor by quite a bit saving like $9 million on Oubre (if we got, say, Kennard back, and let Baynes go and signed Saric to a reasonable deal).
But I'd keep him and try to keep Baynes and work over the cap. I'd prefer keeping Baynes actually because I think he has a big impact on Ayton, but it all depends on money and what we would get for Oubre. But hopefully we can keep both.
I'm in the same boat. I think we'd still be far enough away from the luxury tax that Sarver shouldn't worry about it until at least Ayton & Bridges get their extension which wouldn't be on the salary books until 2022-23 season. Can gauge where the team is at moving forward, along with how well Cam Johnson is progressing. The injury concerns for both Cam and Oubre should play a role too. This off-season though should dictate which direction Sarver wants to go with the team, if he chooses to not keep Oubre, Saric, Carter, Payne, and hopefully Baynes then I think he's all business and doesn't care about ever putting together a good team.