Having no experience in this area, I'm delightfully unencumbered by any historical context. Before I form my opinion, I wonder what the purpose behind numbering a release is at this point? Are we saying that copyleft-next is ready to be used or just that it's sufficiently mature to be reviewed by people who haven't been watching the development process (incidentally, I have a lot of commit messages to catch up on)?
As for the anti-feature nature of license stability, I understand your view from an academic perspective, but I wonder what effect a rapidly-evolving license would have on adoption and enforcement.
-- Ben Cotton