You might be looking at it the wrong way. From what I can gander, these blades are going to be for application-specific use. I can see a double-folding math-character keyboard for Mathematica or design-tool for Photoshop being quite useful. Yes, this whole thing is novel, but as we've seen with the iPhone-era, novel gidgets and quirkets make people go bananas. Nothing new, yes, but still a cool thing if executed right. The big difference that people aren't getting here, is that touchscreen UIs take away screen real estate and are limited in size, these covers can be double or triple-folding and can have all kinds of LED-driven knobs, sliders, and whatnot.