There is no point in drawing a distinction between the future of technology and the future of mobile. I find Evans' analysis of mobile a bit hyperbolic. Yes the growth of mobile is explosive and, in some cases, it's displacing older technology. But for a lot of use cases small touch screen devices are simply inadequate. It's probably true that a lot of people that used to use desktop or laptop computers just to check…
I think the mischaracterization is of what mobile is replacing. It isn't the PC. A PC is primarily a computing device, an iPhone is primarily a communications device.
The iPhone and iPad aren't replacing PCs, they're replacing newspaper, radio and telephone. They're only replacing PCs to the extent that the PC had already partially replaced some of those things.