I'm actually going to argue against this line of thought, and I hope to explain to you why.
Back in the day people used to have the power to mark their question as CW. Part of this was a "good subjective" thing, but another part was the belief that people would collaborate on their answer.
This was not the case.
The reality is that people rarely collaborate on questions or answers, and as good as some of those answers I wrote were, I never received the rep I probably deserved for them. Now you might say, tzenes what do you need more rep for? and you'd be right, but back when I wrote those answers I was not king of the rep hill. Losing that rep meant a lot to me and I was always unhappy that my hard work went unrewarded (though if that second one wasn't CW I would have never split it into 4 answers).
So what did I get out of those answers? I learned what Community Wiki was for.
This is the point I'm going to try and bring across. Losing rep to setting your answer as CW is a learning experience. Maybe not the least painful one, but an important one. It teaches you when CW is appropriate and when it isn't. The reason I don't think these (or any other) answers should be reverted is because they're lessons of the past, and I don't want to diminish their impact.
It is very common to think: I'll write half an answer and mark it as CW so other people fix it. This is a very common misunderstanding of Crowd Sourcing. Making something a wiki doesn't automagically mean people will contribute (much the way making something Open Source doesn't just keep software developing). What's more, the crowd sourcing model that SE uses is one of incentives. You are incentivised to gain rep, you are incentivised to write your own answer (instead of contributing to a CW).
Its hard to argue with the results these incentives have garnered.
So if you want my vote: No. CW need to stay CW.
A number of people have suggested that they mark their answers CW so low rep users can edit (citation). Once upon a time this was a necessity, however, today we have suggested edits, so it is no longer necessary to proactively mark your question CW
Post Post Script
Grace brought up the point of self edits pushing a post to CW (which I hadn't been familiar with). For those unaware, after 10 edits (of the original author) an answer will become CW.
I was a little shocked at this till I started to dig around on MSO. It turns out, this is something, which has been debated before. Ultimately, I don't know if I support this policy, but as it does exist I don't want to undermine it spuriously, and I think reverting CW from original author edits, would be undermining it.
If you want to know the reason for this policy you can find a transcript from Jeff Atwood on the issue.