I am on the other side of the e-book divide (still) than comics author Dave Kellett. In 2012, he posted both in cartoon form and in his blog about the rise of digital libraries, and how borrowing is going to become the new norm. Book ownership, and hardcopy books, will become the rarity while file sharing will become ascendent.
http://www.sheldoncomics.com/archive/120725.html - the comic
http://www.sheldoncomics.com/archive/120724.html - the blog post
I'm not sure that books will entirely disappear, given requirements of physical form for children still (durability and cheap to replace just one that gets broken vs. replacing the entire Kindle), but I can see the tipover for popular "dime store novels" and other common paperback styles.
(Part 1, part 2, part 3)