Background: Vandalism is a problem on all pages, but it is a much larger problem on pages that, on average, have fewer or zero people watching them. One solution to this problem is Special:UnwatchedPages, which was requested by Jimbo, is accessible only to admins, is updated infrequently, and is therefore very difficult (impossible) to clean out.
This problem could be handled by adding an rc_watched column to the recentchanges table to store a watcher-count, based on the watchlist table at the time of the revision, and counting only editors that have been active in the past N (7) days. An alternative to schema modification is to use rc_type to store this information.
This would allow a "recent changes in unwatched articles" page. This page would catch vandalism that would usually have gone unnoticed for long periods of time, and encourage editors to take these pages into their watch-lists. It would eliminate the need for Special:UnwatchedPages. Vandalism of pages on this list would not be a problem, as such edits would be bumped to the top of the list and be twice as likely to be caught, and substantially more likely than at recentchanges due to lower volume.