This is pretty much the nail in the coffin, PC gamers have been propped up by enthusiast but these days are limited, it's known that PC gamers want the best and they can get it right now, but when you notice a console that only costs $500 is more powerful than your $1500 machine you know it's not worth it any more.
In fact according to NeoGAF PC gamers themselves to beat the the PS4K if the leaked specs are true you are looking around to spend $1870 dollars:
How any gamer can justify this is insane. to put it into perspective to recoup costs of buying a 4k pc with cheaper PC games with 'average' savings of $15 for PC compared to PS4 it would take over 70 games to re-coup your initial investment that means spending over $3000 dollars on games to make pc gaming worth it.
Also consider the specs, we are looking at around 4000 GFlops to play 4k games:
PS4K = 2292.3 cm2
PC = 7698 cm2
so...
PS4K = 1.74GFlops per cm2
PC = 0.519615485 GFlops per cm2
PC gamers will need to spend triple the amount to get a 1/3 of the cm2 performance of the PS4K.
While the PC platform slowly starts to rot with SteamOS, Windows Store and other 3rd parties trying to fragment it with what agenda they have, Sony have been smart and took the best parts of the PC and made it so it works such as more powerful hardware, X86, true backwards compatibility and a robust and easy way to play and buy games.
Consoles beat the PC's at their own game, lets be honest here. a 4k box for less than $500 is virtually impossible for PC's to catch up with and with optimisation of the x86 on the PS4, Sony have done what the PC gaming community have been trying to achieve in the last twenty years - to have a platform that flows well with backward compatibility and being able to upgrade the hardware with no problems.