Good luck in fixing it, Albus. Sometimes you simply can undo things, entropy's a bitch that way. The smart thing to do, at this point, if anyone was really inclined to think, then do, instead of react, would be to train Hermione in how to help harness and control Harry's power and then help her get together with him. Mind you, such a couple likely couldn't, and wouldn't, be controlled by any power on earth, but she's got the strength and sense to help brake and control his power and he'd help her develop hers to the fullest. The one who'd really lose under such a circumstance is Voldie, but who really cares?