We were trying to talk her into that already with my brother, but first she looked at is as if we started to run naked in the street, and then kindly asked us to mind our business :)
We managed, after years of effort, to talk her into using a digital reader (I do not remember how we managed to do that). She was always against, and then tried for a week, which turned into two and it is now two years she is using this almost exclusively.
Which is good because she is reading one or two books per week and loves to build the queue of what is left. Least time I checked, it was 100 books.
My father once decided to put some order in her library, starting with a small set of shelves. He sorted the books by size (or alphabetically, I do not remember). It was at a time my mouth was at the hospital, we drove her back home and discovered with her the cleanup, and a proud husband.
We sat comfortably with my brother with some imaginary popcorn to watch the scene what my father was fleeced alive after my mother realized that all her mess (that she knew by heart) was gone.
So yes, books are difficult to get rid of for some people.