Extension:WikiExpire/Proposal

Purpose
I'd like to be able to set an expiration time for a wiki article along with an owner of the document.

When triggered this would notify the documents owner and email/sms/communicate with them about the next course of action. It would not remove the article but would in some way notify the reader that the page has expired and therefore might house dated information. It could even be fancier and have a hierarchy of users to contact if no one responds to the messaging.

Need
This mechanism would be used to remove the amount of document rot that happens when pages are orphaned or forgotten about. I see this extremely useful for any organization that uses its wiki to document an ever increasing and changing operational structure but has trouble maintaining updated documentation.