Voice control has been around forever - duh. Brilliant observation. And while we are making observations, there is at least one computer you can talk to, IBM's Watson, which won jeopardy. Quality voice control is just coming into being.
What I meant was that until we have better voice control / input, a keypad will be necessary because typing on a vertical touchscreen, which is obviously awkward, would not suffice to do say a high school homework assignment.
Even with better voice input there may be some physical interface like a mouse. Right now cutting edge voice control for consumers is what we find with Ford's "Sync." But that would not work for a work station.
Touch screens like the Ipad have their strengths but nobody thinks they will replace computers with keyboards (nettops excepted).
However, if we have a "Watson" interface where we can provide input via voice control: that is the future of computers. With Watson you could virtually ask it to do any function, search any website or dictate a spreadsheet to it. Per your example, you could ask Watson to make your coffee and then put the morning newspaper on the built-in LCD coffee table viewer, turn the AC down to 75 degrees and find out what traffic is for the morning commute and it would be cable of doing all these things with voice input only. Bill Gates's home has many of these functions without an AI interface.