It sounds like an overreaction to me. Some people aren't as charming as others, or pick the most constructive comments, but that's not really anything you want to do something about. And for every post someone calls troll over you'd have at least some small portion of people who well and truly want to have a discussion on the topic or issue, whether or not it drags out the bad behavior in other people who fail to have the ethical fortitude to not just drop it and move on. Trolling isn't as bad behavior as flaming someone who's trolled because, simply put, you just can't put a finger on things that precisely most of the time and out and out call someone a troll just because one (or even more) people think so. If I put out a thread topic like, "Why does anyone play this useless roleplaying game?" I might be trolling or I might, instead, just be trying to start a conversation of a particular tone (promoting people to make defensive polite claims about the hobby).
Most importantly, I think ENWorld has survived as well as it has because it's mostly unpoliced and open to any interpretation of the rules that doesn't blatantly break them. Personally I don't think you'll find a better behaved forum than ENWorld of similar size, it's really kind of amazing.