Potentially, everything that is done in books, music and movies can all be done by a video game - and it can make it better than the original format. It's just that, at the moment, we're still figuring out how games work.
That said, there are times when you don't want to have to interact with a game to make it do something that a piece of music or a movie can do just as well.
I'd say it goes games, movies, music then books for me.