Bollocks!
Oh fondleslabs will replace desktops...utter bollocks! While the marketing types out front might end up holding a tablet to sell something to look modern and fashionable to the punters, the grunt work, all those 10's, 100's, 1000's of thousands of entries which need entering into ass backwards software like Sage and the like will need someone chained to a desk with a keyboard and mouse typing away.
So PC (and I'm using this as a whole desktop/laptop/Windows/MacOS/Linux/whatever as a proper PERSONAL COMPUTER not a load of marketing spiel) sales have dropped, and tablets are increasing? And so what? It’s a different tool for a different job. Yes big companies like HP and the like are listening far to much to ANALysts and not to customers, or they might realise what the punters are doing. The PC, the venerable old bit of kit chugging away with its 6 year old C2D in it, is still "fast enough" and is going to remain chugging away until it either dies (and gets replaced) or the company gets more staff. Why do companies need to replace them on a 3 year cycle like they used to? because during the penny pinching times they realised they don't need to. New kit just means added hassle with down time and grief of getting staff to learn everything all over. Replacing a few machines at a time and yes you have to subject a couple of members of staff, or better still the new fellow to it but all is fine for most users and it keeps the grief down a bit.
Ok, I mention "good old" Sage here, but the same goes for many jobs, DTP, CAD, and even normal word processing for a company. A touch screen, and word processing?! Fine maybe for fast notes, but for all day banging out letters and things. The RSI brigade will have you lynched for it.
Is the PC dead? No. Has it evolved into that device which is only replaced as and when needed? Yes! Are tablets etc "good enough" for the home user online? Probably.