A related idea I have is to support subscription for OPML feeds. That way, instead of getting a private personal feed URL that merged hundreds of feeds that you

A related idea I have is to support subscription for OPML feeds. That way, instead of getting a private personal feed URL that merged hundreds of feeds that you follow on the server side, clients should support subscribing to an OPML feed, which can just be links to whatever you are following (games, posts, users, discussions etc). The OPML feed changes, your RSS client picks up the changes and starts following the correct endpoints.