How will we know that we are reading something authentic written by the original author vs something that has been altered and rewritten? This may have been a problem in the pre-AI world as well, but with the ease one can generate text now I wonder if there is a much greater risk.
What is authentically and originally written is impossible for ai to replace. Write with a quill and ink via candlelight. What is possible is editing. Take your comfort where you find it there. Editing has been changing original manuscripts for centuries for better and for worse