Blasphemy! GUI? WYSIWYG? Now that would be unwiki. Seriously; one of the reasons why we are successful is because there is a bit of a learning curve to being a contributor (small, but it is there). I hate to say it, but this small learning curve acts as a kind of filter against those that have nothing but incoherent and random nonsense to "contribute". If the basic concept ain't broke, why fix it? Wiki is dead easy to learn anyway. But it does require some cognitive faculty and mental discipline to get the hang of.