Having said that, I don't like this idea of turning deletion into a content matter. We would in effect be condoning and encouraging edit warfare by making page-blanking an acceptable edit. For some people, it would be an irresistible invitation to vandalism, for others, a way of suppressing inconvenient statements.
Or delete articles against concensus. If anyone can delete and undelete, the deletion log will be clogged up with school articles and forums. Sure, they can be undeleted again, but AFD is supposed to make a somewhat final decision that can only be overturned by logic and arguments, not a single editor's mood.