Oftentimes when a website is redesigned, the feed URL might change. However, this is often not announced through the old feed before the redesign goes live. If a feed is subscribed to by a certain number of users and is misbehaving for all of them, allow a user to suggest a new feed location, so the other users can pick it up from the Newsblur interface.
It would probably be complicated to implement, but it would be quite useful, I think.