I would think we’re all rather beyond the age of asking our parents to tell us a story about a pretty unicorn and being satisfied with whatever meandering narrative they supply — is that really all you think books are? There’s no meaning the author was conveying, no value in a shared culture experiencing and interpreting the same work and building a common understanding, this can all just be effortlessly replaced by endless atomized autogenerated slop for piggies?

[EDIT] To be clear, it won't need those things to produce a story at all, but AI-assisted stories that have had significant human input applied will be notably better than wholly-AI ones (the kind of on-demand storytelling you're alluding to) for some time yet.