With sufficient quality of the model I can certainly imagine people preferring to read AI generated text in the style of Lord of the Rings instead of the original, as the AI generation can adjust the content and style towards the interests of the particular reader, customizing it to deliver what they want.
For example, one obvious observation from looking at fan fiction creations is that 'shipping' is popular, that certain people would strongly prefer certain characters to have romantic relations - and AI generated Lord of the Rings lookalike could have the story with the particular relationships that particular reader would prefer, based on an AI analysis of their earlier reactions to other books; this is not something that we have working today (as far as I know) but we're not that far from it becoming real.
For example, one obvious observation from looking at fan fiction creations is that 'shipping' is popular, that certain people would strongly prefer certain characters to have romantic relations - and AI generated Lord of the Rings lookalike could have the story with the particular relationships that particular reader would prefer, based on an AI analysis of their earlier reactions to other books; this is not something that we have working today (as far as I know) but we're not that far from it becoming real.