It’s the hot topic for now, so let me just say this:
Yes, Blizzard, using RealID on the forums will reduce trolling, but that’s only because it will greatly reduce posting. While I don’t post on the WoW forums, a lot of smart, competent people do, and the forums are already a much better place than they might otherwise be given the size of the player base.
So yes, you will achieve your stated goal in this case. Good job, Blizzard.