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All moderators can wield the wiki hammer, and no non-moderator can. A similar request appeared on meta.SO. One big concern is that converting to CW is currently irreversible. I'd vote for this feature if CW were reversible (by 5 votes or by moderator, just like closing). Presumably you'd only be able to vote to (un)wiki a question, and a successful vote to wiki would wiki all answers. A successful vote to unwiki would unwiki all answers unless they would be wiki anyway for some other reason. A post would only accrue reputation for the owner when it isn't in wiki (i.e. unwiki-ing a post doesn't give you reputation retroactively, just like wiki-ing it doesn't take away reputation already earned).
hmmm, actually not so good on the SO side. If vote-to-wiki won't happen on SO, then reversibility of CW won't either. That means that we should probably just push for reversibility of CW in SE, and just flag posts for moderator attention if you think they should be wiki. I can also see the argument that the wiki police can potentially get pretty harsh (as they have on SO), so it makes sense to take the edge off by going through a small finite set of moderators.
I've actually been a bit surprised at the lack of contention about CW on meta. I don't think anybody has ever really objected to me converting a question to wiki, so I've never had to defend the decision. When it comes to closing/reopening questions, lots of arguments and heuristics have come up here on meta, so I feel like I understand the subject pretty well. But CW is more nebulous, and I'm much more hesitant when dealing with should-be-CW cases that aren't clear cut.
Also, I suspect people are more annoyed at being told not to talk about a problem than being told they won't get reputation for doing so.
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