Cakewalk to the title (seriously, does anybody look equipped to take them out right now?), then if he walks in the off-season, so be it.
The Warriors could lose Durant this summer, keep the rest of the team the same, and still have as good a shot as anybody at winning the title next year.
Or, maybe Durant walks and they see what they could get for Draymond. Maybe reload a bit.
If I were Golden State my #1 goal would be keep Steph and Durant, but if I decided that keeping Durant was not a possibility, I'd want to keep Steph and Klay in Warriors jerseys for the rest of their careers and try to revamp the rest of the team a little to make it more sustainable.