I don't think he's necessarily a sure or even likely thing, but how cushy really is the OKC job? They're currently very middle of the pack in the Western Conference, and are going to be behind the Spurs, Thunder, and Rockets for the foreseeable future. Having a great star and the middling roster they have also means they're not gonna be in line for any top draft choices. Couple that with the fact that he only finally left for the NBA when he thought he was going to have KD and Russ, when no one really thought at the time Durant was going to leave the Thunder when he hit free agency.
Adding all that up really doesn't make OKC seem like some dream job, but I still know it would take A LOT for him to come to Bloomington and back to the college game.