Sorry for the need to reference such filth as Wikimedia and refer to such pointless debates as 142.X.X.X/Tim_Starling, but, any Wikipedians showing up have to realize right away that the Consumerium Governance problems are so different and more serious than a giant filing cabinet full of libellous trash like Wikipedia. If they import their habits here, we're dead. And since we will see more mediawiki than MoinMoin users, unfortunately, that means we have to take special steps to say "Hey, you can't do that over here."
The best thing to do is move to better wiki code and deal with a better class of people, which suggests MoinMoin again.