Funny how much of the video seems act as if the mouse was the ONLY way that users actually input information into computers in the last twenty years. But even the newest user is going to be using the keyboard and the more experienced a user gets, the more they use the keyboard. And even more, as computers become a normal part of human society, interfaces pandering to novices will become less important, not more important. The question will change, is changing now, from "how do I use this thing?" to "How can I be more productive with this thing"?

Conside that MOST of the data that users input is going to be text, which a form of discreet digital data. A mouse or manipulative multitouch interface, no matter how well designed, is useless for this because it inherently produces analog input which is then translated to a digit action - dragging a file to the trash versus just pressing the delete key.

Photo editing or moving windows are exceptional cases but UI designers are constantly developing clever ways to do them specifically because they allow all sorts of kinesthetic analogs. Yet none of this solves the problem that this isn't the interface a user wants to do most their tasks.