I'm coming around to the belief that OKC and even Durant would consider this a good idea if they get eliminated early from the playoffs. If you look around the league, there are a number of star players who have been vocal about wanting to play with Rondo - all of whom are veterans who begin to realize what it takes to win (or absolutely know how in the case of Kobe).
Durant absolutely does need additional scoring from his teammates, but I can't imagine he is loving Westbrook's unwarranted 3s or out of control style of play in the playoffs where things are slowed down and more methodical. They are poised to make a deep run this year, but if their time is cut short, I don't see how they don't covet a player like Rondo.