No, he will stay for 2 years as that's what his contract says.
If he cannot make it next season, he still has one more season to help the Clippers win a championship. I think it's possible as long as Leonard stays healthy. Actually, even without PG, Leonard and Westbrook would already be enough to lead the team.
Money is not that important to him anymore because it seems to me that Westbrook is on a revenge mode to gain his confidence and reputation again, and I believe that he still got a chance if he will be given an enough time to play as a main role with Kawhi Leonard because being a 6th man in the team was seriously not suitable for him. He just needed some time to take care of his own business to bring back that old version.