Hypothetically, if Durant said he wanted to go to Boston, it might be something to consider. Otherwise, I'd rather have Hayward.
The prospect of getting some value for Hayward while getting a similar player is interesting.
It's a human sport. It'd be tough on Hayward, the Celtic players, and especially Brad Stevens to do that without significant evidence that Hayward will be a detriment to the team moving forward, which isn't going to happen.
We made our bed. Our max players are Irving, Hayward, Horford, Tatum, and probably Brown. Let's right them to another chip.