It's a technicality, but I believe an important one. There has never been such a thing as a 'community de-sysopping' and creating such might be problematic.
If we were to institute such a thing, I believe it should be done with a bit more thought and discussion.
This is the kind of thing IAR is for - so we don't have to come up with detailed new rules to deal with situations that virtually never happen, we can just do the obvious thing and be done with it.