From Richard Justice's live game blog in the HC:

That's enough. There's nothing else to prove. Brad Lidge shouldn't be asked to close another game for a long time. He's simply too fragile, too unreliable. I have no idea what the Astros are trying to prove, but they should stop. They can't allow one guy's problems to sink an entire season.

They have options in the bullpen. They have to use them. Brad Lidge may or may not be what he once was. If he is, it might not be in Houston. That's not the point. Someone else should close.