Many seem to miss the point...
Evolution happens ... The PC has evolved however you look at it whether it is a desktop, laptop or tablet. I am a photographer a tablet has severe limitations but add a keyboard and it's useability reaches a far wider audience. A laptop in a meeting is far from perfect a tablet is excellent. I had a small notebook by panasonic where the screen turned and laid flat over the keyboard, you then used a stylus on the touch screen if you need some typing. The new option is a multifunction PC which is built into a screen (and called a tablet) you add a keyboard/mouse as required. That is evolution a tablet is not new (first shown on TV years ago) what is new is that technology has caught up and made it possible.
As long as the option to add peripherals remains (keyboards, mouse, bigger screen) then all will be benefit. All options have there benefits but one size hat does not fit all as they say...