I think it's a case of, and please acknowledge the irony of me saying this, a lot of people not having the chance to say anything because theres an overwhelming amount of shite spouted, so they lose the habit of posting on sites like WAP, and they end up just casually reading it. I know I can dominate match threads after matches with opinions and I feel like it prevents others putting their points across.
Twitter and FB gives you the chance to say your point to an audience that'll listen, whereas here it gets swallowed up, most of the time.
I'm probably miles out though, as I dont really remember WAP when it massively busy to see what triggered its collapse.