I can see their reasoning but I don't see how this would affect most forum users or necessarily prevent "flame wars." Maybe it's the supposed loss of anonymity.
I, for one, couldn't care less whether my real name is on display or not. When I post I generally do so willfully and knowing full well that I am responsible for my post.
I can see it being a problem for people who especially picky about their privacy and people who only wish to be known by their aliases (or people who really like to roleplay as their online forum alter-ego).