"Be all this as it may, I think that if books have a destiny, that destiny is on the eve of being accomplished; the printed book is about to disappear. After us the last of books, gentlemen!"
This is based on their definition of what a book is (bound paper sewn in between two covers) and in no way captures the entire definition of what a book actually is today. Besides, they were obviously wrong about printed books coming to a demise soon, because in 2018 they still exist and are sold, offering an experience that e-readers and PDF's simply cannot afford.