Ross, I would have thought, in this digital age of ours, when Kindle and eBooks came out they would surely overtake print books in short order, however much to my disdain. But such is the futility of trusting to any future projection, now eBooks are ebbing as readers show a preference for physical books, on the whole; the sellers of the first are struggling of late. The extinction of traditional books as they have been since 1440 should have happened by now, according to all indicators when new-fangled eBooks first hit the scene. Oh, and by the way, archaic vinyl is on the rise, trending in a big way. They may soon overtake CD's; but it would be foolish of me to project any outcome one way or the other, so impossible to see the future is. As that wit Stephen Fry said with perspicacity:
"Books are no more threatened by Kindle than stairs by elevators."