In a word, Nope.
Again you’ve missed the ball here Jeff.
It’s a fairly easy ball to miss though. Yes the devices are becoming more common and PCs are becoming less common, but this has nothing to do with the PC and everything to do with who /was/ using the PC. For the past 20 years it has been everyone from every walk of life. You want to view the web? use a computer. You want to chat with your friends? use a computer. You want to write an email? use the computer. You want to watch a video? use a computer.
Most of those people now don’t need a desktop computer to do any of that, and they have no need for anything else.
But now I will make a very important distinction, a desktop is a PC, a small computing device that is for personal use… is a PC… Most tablets and phones are NOT PCs, in fact most people don’t even own them in reality. Sure they paid for the software and hardware, but they are licensing it. That iPhone you got? You are licensed to use the software on it, but if you go grab an android, you cannot then carry that license over and install the same software on the android device, you have to re-license it.
Many games I play I buy once, and then play on linux, windows, and mac… because I have a broad license. You are buying in to the gated community that is iPhone or android. It is not a personal product, it is a licensed gateway to your software. There are ways around this, jail breaking, rooting, and what not… but these are hacks, and difficult for the average person. Most of these people will never even know what they are giving up.
The PC isn’t dead, but it does need to catch up. Some day soon I’m sure we will have PCs we can assemble, just like our desktop, made from smaller components that we can swap out at a need. Where we can choose to put ubuntu, windows, iOS, Android, or whatever else on it we want… At least that is my hope… And we can take it with us where ever we go, then plug it in at home or work to our docks… with large storage systems and co-processors. Drop your tablet in, and suddenly you have a full on desktop, as powerful if not more powerful than we have today.
I cannot write without a keyboard, I cannot do my 3d design without a mouse. PC is not dead. But I do hope it is changing.