I found The Onyx Project fascinating. A few ideas --

I doubt it's vaguely like a matter of replacing film. As story, they don't function anything alike. A normal (itchy word, but I'll leave it) film is based on external story and operates mostly temporally, Memento and some others notably aside. Even the nontemporal stories progress in a very linear manner -- we see scene after scene. Even the time we spend on any given scene is dicatated, as it is not in a book. We've seen something of how tremendously difficult plot has been to accomplish in linked text. I can't imagine that a medium that relies on inevitably temporal sound and action footage would be easier. Imagine what they had to do -- and what they had to NOT do! -- to get the music to work.