Animated Offline screens
Allowing streamers to select one of their VODs to play as an offline stream or allow them to upload a video that would play while the stream is offline.
livestream.com has this feature when your stream goes offline it can go into auto pilot and play a playlist you setup. Before twitch that is what i used and loved that feature cause old streams automatically were put into an archive and you can put it in the que. Heck right now all i do on my livestream account is upload old highlights and have it loop 24/7.
The only problem to this in general is the type of content shown while offline. Personally for the type of website beam is streamers should be only allowed VODS to take over automatically. Uploading any video seem risky when it comes to copyright and other legal issues.