In terms of writers, the necessary skills will vary widely, from old-timers telling stories to the careful and intricate written sentences of a highbrow novel. There will be a new category of something like “wordsmith techie,” supplying things like the throb of a heart or a ship engine. Authors might have their keyboard setup on one wall and a sound-mixing board on another. Some, of course, will make the leap into pure video and not use words at all -- just concepts expressed in images and sound.
I think that's about right.