Stay.
My reasoning? I think Golden State gets eliminated in the 2nd round to Houston. It would look even weaker if the first season GSW doesn't make the Finals is when KD leaves. His legacy takes another hit, even if it's a bit unfair to KD. This way, KD and the Warriors (minus Draymond and possibly Klay too) would have something to play for next season (avenging Houston).
If they win it all though, I think he leaves for the Clippers. I vote he stays though.