I won't be too happy. But the frustration will be more towards him choosing Golden State over not picking Boston if that makes sense. I refuse to get my hopes up and think we have a good chance at this, so I've convinced myself he'll go back to OKC...even if it's just the 1+1 deal, then we can worry about this all over again next summer.
But if he does pick GSW, I personally think that's a baaad thing for the NBA. Remember at points last year when we all felt the regular season was kind of pointless and that we should just fast forward to GSW-Cleveland for the final? It's gonna be like that times 10. A 73-win team adding a player of Kevin Durant's caliber, 2nd or 3rd best player in the world, just doesn't sound fair.
I think they instantly become the villains of the NBA, but at the same time, will probably be magical to watch from a pure basketball standpoint.