A lot of smaller sites based on wiki-technology do that already. The only reason wikipedia can stay (semi) open is because it has enough people to do regular patrols.
As usual it's a small misbehaving minority in the world who make it difficult to Have Nice Things.
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I think it ends with flipping from default open to default closed. Want to edit Wikipedia? Register and provide your identification.
A lot of smaller sites based on wiki-technology do that already. The only reason wikipedia can stay (semi) open is because it has enough people to do regular patrols.
As usual it's a small misbehaving minority in the world who make it difficult to Have Nice Things.