Hello MZM,
The wiki continues to clutter up
That's not quite apt. I see no backlog of requests for admin action, such as pages proposed for deletion. The number of admin actions of any sort has been low for years. The change in admins was a shift in policy, and resulted in some regular editors there leaving; but the real issues are that a) translation isn't well-integrated on that site, and b) most editors continue to be unable to edit at all, including talk pages, thanks to restrictive account-creation policies. These require dev, not admin, help to fix.
Migrating all but the essential pages to Meta is a worthy idea, one discussed for some time. Every editor on that wiki can work on that. Most of the links on the main page already point to other wikis and wikimedia sites. Regards, Sam.