If the Phils stay in contention, I don't see Flash being moved. He's a good closer.
For the Phils to sell him off means the wheels have to fall off. They would have to lose most of their games. So at that point, it wouldn't matter who the closer is because he would get almost zero opportunity.
There's alot more unstable situations at closer in the NL than in Philly. SF, ARI, HOU, MIL, CIN, ATL, FLA, did I miss any? If you're looking for surprises, maybe you should look more at those teams.