I'm not really sure if we actually need any rule for removing posts. A post gets removed when the Powers That Be decide that the post is not worthy of being on Perlmonks. I have this faint hope that the menace of losing 5 XP keeps posts from being so bad that they need removal - not even princepawns and maleteen2000s posts are really worth the bother of removing them, as they keep somewhat on topic (with maybe the exception of that Review spam).

I think a node should only be removed, if there is a public outcry above and beyond ---voting, that is, if people not only complain anonymously but openly about that node. If a person collects many quite negatively rated nodes, this might be enough for both the person and the administrators to reconsider the membership of that person though.

I think no node should silently disappear and it should never be an automatic process but a process of discussion, because maybe these automatic rules might sometimes need discussion themselves.

Of course, this places even more of a burden on the administrators, but negative voting already helps them keeping unpopular nodes from the front page.