Enjoying a book without having an actual book is not a new phenomenon.
Audio books have been around for a long time (remember they used to come on cassette) - in fact they've been available in some form or other since the 1930s.
But it wasn't until the 1980s that retailers began to display them on the bookshelves.
Even then, their popularity would seem to be restricted to the visually impaired and the long-distance commuter.
I tried an audiobook from the library recently, the paperback version was checked out. Perhaps my attention span isn't quite what it could be, but I struggled to concentrate on the story, despite the lovely vocalisation by a former Law & Order actress.