It would make it much easier to keep content online, as everybody could mirror content with close to zero effort. That's quite opposite to today where content mirroring is essentially impossible, as all the links will still refer to the original source and still turn into 404s when that source goes down. That that file might still exist on another server is largely meaningless when you have no easy way to discover it and no way to tell if it is even the right file.
The problem we have today is not storage, but locating the data.