I don't have too much faith in this idea, but RealID could limit trolling and flaming, not by revealing the troll, but by revealing the victim. It's easy to be a jerk to Lawlgoleslo, but what about John? Maybe the assholes will see that they are being assholes to real people, just like them. Could this evoke mercy, sympathy, human connection?
I'm sure it will.
I'm equally sure that the truly horrible people will have that much more with which to attack a person.
I'll take a thousand flame wars over one real life incident.