If I adopted the same policy (i.e. replace non-digital with digital) for books, I'd still have most of my books. I randomly pulled a stack of books off my shelves and attempted to find them as ebooks a while back. I was very liberal in my searching: checking both legal and illegal sources, DRM and not, Kindle and ePub. Even so, I only had a 10-20% hit rate. And I say that as someone who loves ebooks and doesn't get all fusty and emotional about books (when you have to carry a big sack of them across London, you quickly lose any sentimental attachment to dead tree as a format).