When I look at my laptop's screen I feel that my backbone is not straight. And, sometimes I feel neck pain. If I move down my chair (or put the laptop higher) then I have sore arms and shoulders. None of the following images make sense to me. Nobody puts the screen that much high, nor they move their eyes down to look at something on the screen. At the position that is claimed to be correct, you need to move your eyes till the end to see the windows bar.
I would feel much comfortable if I had a chance to move the screen up just the half of the height of the screen in the picture below. So to say, there should be some distance between the keyboard and the screen.
Besides being light-weight, laptops should have sliding hinges that allow users to move the screen up or down. I know that it would change the center of the gravity, but this problem can be solved with a simple trick by the designers. Maybe, there are some companies that are doing it already. I would really like to know the name of these companies.
Besides, with the developing technology (or it feels like that) a small projectors can be used instead of screens on laptops.
EDIT: Price range would be between 500 and 1000 USD