I agree. Even something as simple as a boolean that triggers a banner saying "this project is looking for a new maintainer" would be useful both from the perspective of project owners who want to move on or from the perspective of users who can't tell if a project is maintained based on how long it has been since a project uploaded a new version (which is why I think someone suggested sending an annual email asking for a human action to say "alive and kicking" to help determine if a project is completely abandoned).