Maybe there's an opportunity for a media host to farm out data for preservation by clients (end users' computers) - what I'm thinking is torrent essentially, where the data-unit is a scene (or a series of frames between n key-frames). Clients get access to that show if they agree to store m chunks. The media repo can sell access whilst only keeping a copy in cold-storage because you can 'popcorn time' the show from the pool of user-clients.

Reduced hot-storage, increased playlist. Sort of media communism but the capitalists still hold the keys?

This can never be legal. When I worked in media streaming the copyright owners were very specific about what we were allowed to store, and wouldn't allow unencrypted files to be transmitted to any other companies.