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I don't think this is necessarily about replacing stuff like the keyboard and mouse though. If you look at where touch and gesture-based interfaces have really made inroads it isn't the traditional computer power-user, it's been casual use (including gaming). Just because we still have good use cases for keyboard + mouse doesn't mean the impact of good touch based displays hasn't been enormous. I don't think it's out of the question that other interfaces that overcome some of the issues with touch will come to prevalence in the near future.

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