Interesting move, although I'd bet it will turn out to be a challenge to enforce, if the Scientologists decide to try to fight it. It will also be interesting to see how this move would hold up in court. I can certainly understand Wikipedia's point of view - they aren't discriminating against an organization but rather dealing with a group that has been quite disruptive to them. It could be interesting to see which way it swings and what the ramifications are.
It won't go to court. Nothing of any value stays on w* without proper citation (so there goes libel), and since there's no financial consideration for participation in or use of w* the CoS can't claim injury in the legal sense.
