The suggested rule isn't that complex really, my bad. The discussion about it, however... If not complex, it is, at least, long.
I still think it isn't particularly necessary to formalize things to such a degree, but hey, we have a inter-book hiatus right now, I guess we need something to talk about
If we have to have a rule, then I think Jasdoif's wording makes the most sense. I wouldn't worry about the exact meaning of "majority"... That would be sorted out by thread consensus, if ever the case arises.
And, for sure, any rule addition needs a vote, if only to avoid protest further down the line.