Alandriel, I've understood from my first day here that invite threads are deleted. That's the understanding under which we all posted in them. I don't think it should be subject to a vote—the threads that discuss inviting specific people should go, as was promised. Not to do it would be unfair to everyone who was honest in those threads, believing it could never hurt the person concerned.
I think the general procedure threads—anything without discussion of specific people—could just be archived invisibly for now.