BTW, GH already has a feature that if a repo gets deleted, and it had forks, then the most starred (AFAIR) fork becomes the "master fork" and other forks have t

BTW, GH already has a feature that if a repo gets deleted, and it had forks, then the most starred (AFAIR) fork becomes the "master fork" and other forks have their link "forked from..." updated. It would be a good idea to do as you propose: if the maintainer doesn't click a button for X months (and the button is prominent when you're logged in, impossible to overlook), make another fork a primary fork.