Ever since the first iPad was introduced by Steve Jobs way back in 2010 there has been the argument about whether it is just there to be a media consumption device, or can actually be used for what PC users seem to be so determined to call 'real work.'
Steve Jobs knew, or at least he hoped that iPads would eventually replace computers as we know them. When launching the first iPad he spoke of his new tablet as a car, and the computers that came before it as trucks.
I'm trying to think of a good analogy. When we were an agrarian nation, all cars were trucks. But as people moved more towards urban centers, people started to get into cars. I think PCs are going to be like trucks. Less people will need them.
He knew the transition wouldn't be easy, and he was right.