We have a few questions that are asking about the current state of affairs of something. Of course, “current” has a tendency to change with time. They're not off-topic or unanswerable, and unlike crystal-ball questions they don't become pointless once answered. Whatever answers they gather do tend to go dramatically out of date at some point, though.
(I'm sure there are more.)
One of the site tools we have is setting a post to Community Wiki (CW), which drops the reputation needed to edit it (without reviewer approval) way down.
We also have a mod-tool to lock out other answers, which prevents new answers that should have been wiki edits and focuses the page on the singular wiki post. It does a normal lock on the page and adds this banner:
This question's answers are a collaborative effort: if you see something that can be improved, just edit the answer to improve it! No additional answers can be added here
The other thought that inspired this idea is that we don't like editors to completely change someone else's answer, but this injunction seems intuitively (to me at least) to not apply to a community-edited wiki post. Seeing an accepted answer like this one become obsolete, the value of completely rewriting it seems more evident, and if it had been a CW it would have been already.
Would this be useful for any of our questions that are good but naturally prone to having their answers (and the votes on them) broken by the passage of time? Maybe it would be useful for some of these kinds of questions, but not others, based on a distinction I haven't thought of?
Just throwing the idea out there. CW is a site feature that has a poor reputation, but I wonder if something like this would make it sing. Thoughts?