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The vertical touch screen use case will really only be a factor at kiosk-type installations, which have a short usage time. Any extended use is going to be done on a laptop or desktop, which has a trackpad or mouse to fall back to if it even has a touchscreen, or a tablet, which can be held in an ergonomic manner. You seem to be inventing a form factor that Microsoft isn't promoting, just to be able to criticize it.

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I don't think that's necessarily true, though I disagree with the GP. He mentioned in the video, and they're already demoing this at places like best buy, ultrabooks will be coming out with touch screens en masse once windowes 8 is released. A lot of them pivot, but after using one briefly in a normal mode, I found that I was clicking smaller things with the trackpad, but that for big things (like the start screen), it was much more convenient to quickly flick the screen than to go and use my dexterity on the trackpad. you wouldn't use touch in office, for example, but you might use it for navigating around the operating system quickly and easily.

Touchscreen only works on mobile devices for extended durations, end of story.

The only input scheme that would be an enhancement to mouse/trackpad and keyboard is something akin to Leap Motion: https://leapmotion.com/

Who said something about extended durations? These would be very short durations.

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