I like DPB's idea of gentle milestones. It would give contributors something to aim for, like:
* Let's work together co-operatively and try to create the next milestone version.
It would also make it easier to do a "diff" between the current version, and the one which (months *ago*) was agreed upon as a consensus version:
* On the article's History Page, just click the "cur" link on the milestone version.
If the milestone idea gains traction, what's the next step? Submit the idea directly to the developers, or create some sort of vote page at the website and wait 2 weeks?
Ed Poor Bureaucrat