I agree with Milos when he states in another thread that we need to think further about a solution that is satisfactory to a greater number of people, at least when it comes to standardizing attribution requirements with effective application to all past edits ever made.
Indeed. Perhaps our first step should be a non-binding straw poll with a wide participation as possible (so using central notices and BoardVote) to find out what people think of the various ideas that have been proposed (some kind of preferential voting). Then we can have a more constructive debate about the finer details once we have a general idea of what the community wants. We can then have a binding vote on a clear proposal. (We should also seek a variety of legal opinions from a variety of jurisdictions regarding the legality of various proposals.)