I had heard that MLB is considering reversing the call. I don't see the harm in doing so, since it wouldn't change the outcome of the game.
Bud Selig chickened out on doing just that. But, Galarraga has handled it with pure class.
If I was a Tigers pitcher, I might be tempted to say something to my catcher, when Joyce was working behind the plate, to the effect of, "Look--I'm throwing at his head. Don't try to catch it." And bounce one off his face mask head-on. I think that the message would be sent at that point.