Are books not interactive enough?

A columnist at Computer World opines that the reason young people don't read books is because they are used to more interactive media like YouTube. He glances at the book publishing world in Japan where last year five of the top ten best selling books started as stories written by amateurs and distributed by cel phone. Western publisher Penguin tried a novel written via wiki but that project hasn't really gone beyond the concept stage. There is also a small group of English speaking fiction bloggers (Ahem, "floggers.") but that concept doesn't seem to have broken out of being a fringe hobby. There have also been some stabs at video book reviews but, really, if someone won't read a review what are the chances that they will read a book? Amazon has long allowed reader comments, and readers even comment on each other's comments which seems a lot like the interactivity books are supposedly missing. Add to that the fact that many authors keep active blogs or foums (some of which are directly accessible through Amazon and similar sites) and it seems like books are about as interactive as they can be while still being a coherent set of ideas. What do you think the future of the book is?