Meh, that's debatable.
KD just bailed out the Warriors front office, who've insisted all along they would match any Harrison Barnes offer sheet. Now, they don't have to match the Mavs' stupidity. And although it's plausible KD could bounce in a year if the Dubs don't win a title (far from guaranteed), that will be widely viewed as an incredibly weak flip-floppy move. Even more so than joining a super-team you had on the ropes 3-1 in the WCF.
Did you see Ezeli in the Finals? The problem for the Dubs is that they are capped out, so they can't go out and get other good players (besides KD). So strategically they're better off eating the luxury tax and retaining Ezeli. However, that guy played like a bum when Bogut went down. I think you're better off paying some journeyman big $5M than Ezeli $12M (+ extra tax). You're not getting 3 times as much production from Ezeli vs. the journeyman.
If they truly can't move Bogut, they'll move Iguodala instead. Iggy is a tremendous glue guy, and would be scooped up by other teams in a heartbeat. While I'd much rather keep Iggy than Bogut, doing so could arguably leave the Warriors exposed to bigger teams. KD will be playing PF a lot, and as a "center" in small ball line-ups.