But will the books?
If you and five buddies have iPhone tyle devices and each one can 'link' via bluetooth/wi-fi/etc... to each other... do you really need to have a book to let you know what your powers are? Do you need counters to let you know to use an action point? Second Wind? That you're weakened?
I dunno. Don't get me wrong - it's nice to have a physical book. But I do agree that physical books for D&D are going to start fading away. Now, I dunno if the same can be said about other physical books - certainly the schools have a stranglehold on class books, and I doubt they'll ever let go of that, and I'd like to think that fiction and a good softcover will always be around - but for D&D? I think physical books are on the way out. It's going to be a slow process mind you - possibly very slow - but I think pdfs are the future for gaming.
Edit: I pertain this to laptops though. Screw iPhones. Overhyped boxes of crap. <_<
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