I won't address the legal concepts, but I approach the use of the material in different formats from the perspective of what I would want if I were the author. I'm not a published author of fiction, only a bunch of boring technical manuals written for various software companies over the past few decades. But if I were a published author of a fiction novel, I don't think I would be opposed to someone adapting that novel to another format as long as they stayed true to the over all message and statement and theme of the novel. Novels are often reinterpreted for the big screen, the little screen, theatrical plays, children's books, etc., and done so in a manner that keeps the new format version in line with the theme and message of the original. Admittedly graphic novels are not something I get into, but who knows how many people can be introduced to a novel like To Kill a Mockingbird through this format.

Who knows what formats will be available in the future. I think a Holodeck format would be really cool in the future where one could either observe from different positions and locations, or even participate as one of the characters. But I'm probably too old to ever see that happen. I would never rule out any new formats when I cannot even imagine what might be available in the future.