I could kiss you for quoting the Hitchhiker's Guide right there viral.
... But it would probably end in a hatecrime, so you know.
The simple reason why it's going to be a while before the PC is threatened, is because making things smaller currently also means making them a lot more expensive, and usually less powerful.
A traditional PC is just more bang for your buck, at the expense of being relatively immobile and large. There's obviously still going to be a market for more power, at less expense.
iPads are selling like hotcakes, which is amazing, but how many people do you know who forego a PC to own one of those things? I can't think of a single person in my network.
Asking a question like that should've made Peter Suciu abandon the angle he was working on that piece, but for reasons unknown, he didn't consider anything like it. Journalism is really in a wierd place right now.