Is it Rik Myslewski or Mark Dean on drug !!!
... or perhaps they just have never done any real work on a computer (blogging your misinformed opinion isn't work!)
What an absurd article. It has no basis in reality. Consider the scales of computing kit. At the pinnacle you have your workstation PC (the most powerful most capable computer, with a huge array of large monitors and peripherals which allow it to do almost anything very well). Next, and quite a huge step down is the Laptop (less powerful, less capable, a lot less connectivity, but portable, and for some this is capable enough). Down another step is the Notepad (even less powerful, with an even smaller screen, and less use-able, but slightly more compact portable). Then at the bottom of the techno pile, the meager Tablets and Phones (ven less power, even less useful, with even smaller screens, and even less connectivity).
For many folk, a Tablet and/or is pointless as a serious computing device because it is SO under powered and incapable. As a portable device it's ok for txt'ing & phone calls, GPS can be useful, or even surfing the web if it's important, or playing a game if you're bored waiting for a bus, or using as a media device, but it's barely use-able unless you have a seriously light weight work load.
Realistically you can't do Audio Recording/Production, Video Editing/Production, 3D Production/Rendering, C.A.D, Web Dev, Serious Gaming, or many other professional applications on anything other than a PC because on any of the other devices the screen would far to small to be professionally use-able, it would be under powered (so take longer - if it could cope at all), it would not have adequate connectivity/capability/drive-space, and you cannot blind type a touch keyboard on the tiny screen.
(Ok, some Laptops can do some of the tasks mentioned above in a limited fashion or with compromise).
How can you plug in say,... 3 monitors, 2 sound cards, 2 midi keybs, 2 control surfaces, jog-wheel, scanner, printer, tablet, webcam/mic, usb2 hub, usb3 hub, mouse & keyb into anything other than a PC? A Laptop couldn't cope, and Notepad would be even more inadequate, and Tablets and Phones are just laughably inept (espesh if it's so stupidly designed it doesn't have any USB's).
Of course, if all you do is blog, txt, and play angry birds, and you're rather desperate to convince the world and yourself that you're cool (and quite, quite gullible) then the meager tablet probably would be more than adequate for such small needs, and you may actually believe that YOU have no need for a PC and therefore, as YOU don't need a PC the PC era is over. But for many many millions of professionals, the PC is the only option!