I am both a fan of books and AI. A clear win would be if the digitised copies would be made available by the AI companies for the long term, but unfortunately I doubt that will be the case (and probably they also wouldn't care enough compared to e.g. a project Gutenberg approach). Buying up books to digest them and throw their remnants in the trash feels like a destruction of culture - even if no one else has read these copies in years, their existence is still a record that may be useful in the long term.
So a challenge to the AI companies - go on, but please share the results with preservation societies like Gutenberg. And please be thorough enough in digitising to keep these copies useful.