Trolls by their very nature work to circumvent restrictions on their trolling. Trolling will not go away because one's "real name" is available for all to see. Don't be surprise when a lot of John Does start showing up on the forums. Forcing full names to be displayed will only make the trolls job easier. Now a quick google search will return a Facebook page, Twitter account, YouTube tube channel, blog, and from there a little judicious ready/watching will net an address and/or phone number. Even if that information is not listed explicitly an address can be deduced from incidental information that is left by the poster or his friends (venues visited, local news, name of a school).
Personal information should be controlled by the individual. It is not morally right for Blizzard to force people to give out personal information TO OTHER PEOPLE just to use a service. Some would argue "I already gave Blizzard my personal information. This is no different." I would point out that the information that Blizzard has was given to it only so that trust could be established between the the individual and Blizzard. Blizzard needs a phone number, and address for billing and support purposes to establish the ownership of the account. Beyond that point personal information should stay personal. There is no reason why I should be forced to give personal information to everyone who reads my post.
Why do I care if my first name is attached to a post? I care because I do not trust you. Yes! YOU! I have no idea who is ready my post. The GIFT [http://www.penny-arcade.com/comic/2004/03/19/] doesn't apply just to how people act in forums; it also covers how people act behind the scenes. I don't know what you'll do with any thing I do or say(no matter how harmless it seems), so I will not give out more information than I feel is appropriate if only to restrict my embarrassment to an account name.
Does The Escapist force people to use a real name? No. Is it's forums over run with trolls? Not from what I can see. Slashdot is a science, technology, and political site that allows anonymous posting, but the threads are not a sea of spam posts (I wouldn't be surprise if Slashdot had more posts per day then the official WoW forums). Why, you may ask? Both sites are moderated. Escapist uses traditional moderators, and Slashdot has a self moderation system. Neither system is perfect, but trolling is kept in hand. Blizzards approach will not have much effect on the trolls and will adversely impact its legitimate users.