Unfortunately it's not anymore, not at least in the traditional sense just follow the money. Right now the money is in mobile and the cloud and since that is where the focus is the traditional PC gaming we've known and loved will be around but not like what it used to. The company to watch is going to be Ericsson, it may seem odd but the ball is firmly in their court whether PC gaming lives or dies and right now so far it's going to die.
Ericsson bought the rights to Microsoft's "media room" platform that more than half of all ISPs are using to provide television service / internet; we use it, a lot of people use it. Microsoft really screwed the pooch by letting this go because the steamroller that is the PS4 is fixing to plow them down using it. Essentially media room is a framework that IPTV is based on and with it any sort of multicast or unicast video streams can be sent to any device. This is essence what Sony's Gaikai tried to do but could not perfect because it didn't own all the patent rights to the video compression they needed.... well now they do vica-ve their joint venture with Ericsson.
Now that they own the whole she-bang there is nothing, *absolutely* nothing stopping them from launching Playstation Now as a netflix like subscription that could be bundled with us (Uverse) or Verizon (FIOS) or anyone else who uses the Mediaroom platform and pushing full 1080P gaming streams to any set-top box or phone they like and I'm talking with as little as 3-6mb/s which is very doable on most LTE smartphones and internet connections. The day they roll that out is the day PC gaming dies because why bother? Why buy a $2000 overclocked rig if I can just hook up my 4K UHDTV to my free set-top-box that the ISP gave me and play any game I want, PC, Xbox, PS4 whatever.
The moment that choice is given you can kiss PC gaming goodbye and its coming, very very very soon. PC gaming 2.0 will all be about "what kind of monitor should I buy if my internet speeds are X" more than what graphics card gets ___ FPS. You watch... hell just go look at their website.
https://www.gaikai.com/