Tablet revolution? Didn't Microsoft try to spark that some 6-7 years ago? Tablets have one issue, and that's a backlit screen. I know my eyes suffer from working in front of a computer all day. If I want to sit back and relax, I need a neutral surface to stare at (i.e. a book, or the e-ink readers like Kindle and Nook). That e-ink almost looks like a real book page. Stare at a back-lit screen, and you know the image is "synthetic".
Still, I don't see a big market for these e-readers. Its a dedicated device (the web browser on the Nook is gimmicky at best). They're too expensive (still), and too feature-limited to appeal to a broad range of people. Still, my wife loves downloading books on the fly to her Nook, and being able to take her entire library with her, and no, she doesn't have an iPad/iPod/iPhone/Tablet/etc.