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I imagine that talking or gesturing to the device will be the main way to perform input. who knows how gesture or speech will be picked up by the device ... is it worn like a watch or glasses?
Output from the device will be either projected onto our retina, or displayed on some transparent thing on or in the eyes... eg contact lenses or some kind of plastic in the lens of the eye.
I suspect the form factor of phones isn't going away and that it will be a little bit like cars -- a stable configuration that exists for a good long while.
The particular set of advantages provided by a screen that is about the size of a smart phone will be with us until numeral links are commonplace. Perhaps that happens in 20 years, but I don't think it will.
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