My brother just upgraded his nice "open" platform PC so it can play 2013 PC games with decent (but not top notch) performance. It cost him more to do this upgrade than the cost of buying a 500GB PS3.
So I think this guy's comment is barely technically correct. It's more like a technicality. Sure your can upgrade your PC annually, but the reality is only a small minority of people swap out parts of their PC on a regular basis to stay up with current tech. Most people will treat their PC as a closed platform, and when they want / need a more powerful unit their current PC will be 4-5 years old so they will buy a new PC.
In practice PCs are closed platforms despite the fact that in principle they are open. People taking advantage of the openness of PCs are the exception to the rule.
This also means game developers have to develop for PCs that are about 3-4 years behind current tech. Because so many PCs out in the wild being used for gaming are 3-4 years behind current tech that developing with current tech in mind would stupidly limit the sales potential of games.
The theoretical advantage of PC over console is quite a bit larger than reality on the ground.
Also most developers seem to be pretty happy with the specs, seeing that there's a lot of creative potential that can be unleashed on PS4 and presumably a similarly spec'd Nextbox.
“The fundamental cause of the trouble is that in the modern world the stupid are cocksure while the intelligent are full of doubt.” - Bertrand Russell
"When the power of love overcomes the love of power, the world will know peace."
Jimi Hendrix
