Why would singleplayer FPSes be the sole genre that's considered as "PC showpiece"? Because that's the only way what you wrote is true.
It doesn't have anything to do with FPS, you missed his point.
It was the only game that pushed requirements to the very edge. It had nothing to do with the genre and everything to do with decisions made by the developer.
Most developers/publishers know better than to make a game that will only run on the very best hardware because by doing so they drastically limit their market and also increase both returns and support tickets.
Instead you get games with lots of graphics settings so you can match the game's graphics to whatever horsepower you have available. Games that will look great on great hardware and good on good hardware and OK on OK hardware.
Watch Dogs easily looks better than the current PC version of Far Cry 3.
Apples and oranges. Matter of fact, unobtainable apples vs. easily acquired oranges, lol.
The more consoles become like PCs the less likely to ever see consoles have even a minor edge in graphics. There was no edge last generation, there was no edge the generation before. This next generation's hardware is just a twist on the same graphics technology anybody can add to their PC. Odds of it looking better than the best PC kit? Nil.
Consoles have a lower up front cost and will typically perform better at their price points than an equivalent PC. Isn't that enough?
Except that SSD are only good for OS and not gaming thanks to the average 3k writes per cell
Not true at all. Every spot in any game where you see a loading screen you could see it for a far shorter period of time if you were on SSD.