Here is the situation:
- A user posted an answer that was correct five years ago.
- The answer was accepted.
- Recently, the rules changed. The answer is no longer correct.
Someone tried to edit the answer so that it would again be correct, but the edit was rolled back and the user was reprimanded for substantially changing the content of the post. A mod suggested downvoting and posting a new answer instead.
I don't think this is the best course of action. I find it unlikely that the correct answer will ever be accepted, because the question author has been absent for over seven months.
Should we make allow editors more flexibility if an accepted answer was made incorrect by a rules change, and both the question author and the answer author are inactive?