and a number of air plane manuals are already on the iPad, with the ability to tap a diagram and zoom in for a closer look, and videos of repair procedures.
Yep. We just added another (Garmin) GPS to our Cessna and it has a "quick start" guide that is printed, but everything else you need to know is online.
The iPad has great appeal for lots of pilots because you can purchase apps and software that allow you to download XM satellite weather (very helpful when you're flying in the clouds/no-visibility weather) that is almost real time.
A friend's wife once got on the Garmin website via their iPad while they were overflying a large metro area in order to look up a function/feature.
I can get (FAA approved) charts, runway diagrams, airport diagrams, etc on an iPhone or iPad and then enlarge the type so that I don't have to switch to my reading glasses. The FAA mandates on my airman's medical that I have to have "corrective lenses" while pilot-in-command, but they don't say that I have to use their printed materials when the same approved materials are available via e-book/e-publication.
The link you provided is fascinating! THAT is exactly the kind of stuff that publishers can offer via the "e-book revolution" that the majority of self-publishers cannot and that DOES add tremendous value.
And even with all of that, I do not think printed books/publications will ever be extinct. They might become a little harder to find, but I remember when some consultants urged us to go "paperless" at our ad agency. What a farce. With what everyone was printing from the e-mails and pdfs, our paper consumption almost tripled.
I'm usually very slow to embrace a lot of new technology--most notable exception being the (Apple) Macintosh computer. Got one in 1985 and have not been without one since, and have never had less than two in the house since the mid-90's.
E-books took me a little longer, but now that I have even the most basic, entry-level Kindle there is, I'm hooked.
BUT. . .
for some of my favorite author collections, I'll continue to buy their hardback releases and/or paperback releases just for my library of physical/printed books.