it needs quantification...
'the pc is dead'.. pc what, exactly?
pc file server: there is NAS, and NAS cloud stuff (not suggesting it)
pc monitor: ok, so its connected to the tv set by some manner or other, and there is no 'computer display', other than changing the input of the tv.
(4k displays for $500 by the way, only 30fps, but 30 inches, people are monitoring on them just fine)
PC mouse: we have seen how a phone can be both a touch pad and an air mouse, if you need it to be (not my choice)
As to the 'pc' thing, I have an android stick i run ubuntu on.. is that a pc? if not, why not? .. it has as many inputs as most pc's for the last 30 years, more than some 30 years ago. and a hell of a lot faster than 15 years ago.
This is the definition of the edge of mist.
For clarification, PC means "Personal Computer". Most of the things you are calling PC there are actually PC peripherals, or personal computer peripherals. In other words, things you attach TO a personal computer, not an actual personal computer themselves.
A NAS is not a personal computer. NAS devices have a computer inside them, but they are not personal computers. They usually run on Linux or Unix, although some have a version of Windows on them, but are not directly usable as a personal computer by human beings. The computer merely controls the file system, security and the network controller for remote access.
A personal computer is merely a computing device that a human being directly uses for computational tasks (running software). Not the peripherals you attach to that PC, nor the servers and other network devices that you remotely access.
It doesn't need any "quantification" once you have properly defined what "PC" means and realise all these pundits have been doing this since the 80s whenever they don't have anything real to fill their columns/airtime.
And to the guy who thinks Acorn didn't die. It did. Everything after that was just flogging a dead horse, much like the years that Amiga fans struggled to revive the totally defunct and dead Amiga platform. It would have been nice for both of them to have evolved into modern systems, and my most pleasant memories of Elite 2 were on Amiga, before the DOS version was even released (the DOS version was a pain to run), but they didn't survive. They died and it didn't mean the end of the desktop.