this would be cool, but I could see it causing issues for places like Memory Alpha, which have a really strict and well-defined manual of style and acceptable references. I frequently see things on other wikis that you’d never see on Wookiepedia, Tardis Data Core, and/or Memory Alpha, like fanart embedded in articles, links to YouTube videos, incomplete drafts without proper tagging, etc.
EDIT: Conversely I could really see it benefiting the smaller wikis, especially ones with lots of overlap with each other (all the various Marvel/DC wikis, the specific Clone Wars wiki separate from the main Star Wars one, etc)