Thanks for the timely response.
- Pity
- As far as providers go, a peek at http://timetravel.mementoweb.org/about/ shows a current list that's already pretty impressive, including many nations' archives, the internet archive, and github! There are two browser extensions out to provide clients on Chrome, two more for Firefox, and of course there's always https://github.com/ukwa/mementoweb-webclient
- If the main obstacle is just that new versions of templates create changes to old versions of wikitext the solution is simple: just archive the rendered html rather than the wkitext. Even a pdf archive would be better than nothing. That's what the UK national archive does, and archive.is too. As I understand it, they don't do so for WP mainly because they are expecting that WP intends to do its own.