I like that idea but can’t help but think there must be a better way to make sure topics in Community wiki are wiki topics. I just checked and there is no filter for wiki (or not wiki), and there is also no bulk action to select topics and convert them to wiki (or not wiki). If those two features existed then it would be a no brainer to get caught up on this task.
I made that topic a wiki.
If there are topics you come across that you feel should be wikis, please just flag them as “something else” and let us know they should be wikis. We’ll be happy to make the change.