I kind of think OKC keeps him, although I agree they should trade him.
I personally think OKC is okay with being a "playoff/1st round exit" treadmill team, because they still sell out. This is a business after all. A product that can put fans in the seats is important. Yeah they aren't a championship caliber team, but most teams aren't anyway.
There would be a lot empty seats if they did a rebuild. They might just keep the treadmill going like they've BEEN doing for YEARS.
If they were fine with being a 1st round exit Steven Adams wouldn't be available in trade, let alone PG. If Bennet not wanting to pay the tax is true then it goes against everything you've said.
You have to talk about the circumstances that lead to the treadmill to get the full picture, they couldn't lose Westbrook after just losing Durant. This time it's different because you just re-signed a guy and he still demanded out. A rebuild is the only option but then you still have to deal with the fact that you're in Oklahoma.
Nobody's watching a lottery team and that's what they are with Westbrook/Adams or not, keeping them means you're paying over 200 mil for pick 5 in the next couple of drafts.