Science fiction gives us all sorts of ideas for futuristic interfaces, and I think (and hope) many of them come to fruition. But cursor position dictated by ey

Science fiction gives us all sorts of ideas for futuristic interfaces, and I think (and hope) many of them come to fruition. But cursor position dictated by eye movement will be tricky or impossible---we can more or less do this now with the right equipment, but your eyes saccade all over the place, subconsciously, even when you think you're looking at just one thing. You've noted the biggest problem with voice input: it'd suck anywhere other than a private office! (Not to mention the homophone errors. True voice recognition is AI-complete.) Finally, look up the fate of the IBM PC Jr keyboard to find out why a fade-in touchpad keyboard will be less than ideal for fast, reliable text entry....