I guess the next one in line should be getting rid of file as a concept. Not much point knowing where exactly the song you want to listen or a movie you want to play is stored.
What we really want is the user's concept of a file decoupled from the system's concept, and then cleansed of various baggage from the prior coupling. That's very different than making it a system concept exclusively.
The aspects that the user can do without are related to sharing the file system with software that uses it as a backend store.