Correct me if I'm wrong, but I think that the interface presented in the video won't become a primary tool for engineers. I believe that mouse+keyboard have two significant advantages: they allow to do more things at once and provide more precision (movement, measurement etc.), which is crucial in CAD I believe. I can imagine that adding voice commands ("Move object X 1mm left") could be helpful in that matter, but doubt if it would be sufficient for any more complex task.