PC gaming won't go away overnight. These are the systems that game developers are using after all.
On top of that, your average APU/CPU graphics is good enough for light gaming, and the level of that 'light gaming' has been rising very rapidly, faster then the high end graphics for sure. People still get PCs for doing non-gaming tasks in the form of laptops, with that access comes the potential to game. Indy PC gaming with the Steam community and others is having an impact. Look at Minecraft as a prime example of a simple gaming concept taken to extremes. This gets people started on PC gaming. With the realization that you don't have to pay $60-70 a title to stay entertained, more people are turning to PC for cheap entertainment.
I agree on the mobile saturation, people now consider it a staple thing to have and are now just replacing existing devices. Mobile gaming was even popular on the early cell phones with tiny LCDs, so really it has just attracted that same crowd. Nintendo more or less has the mobile game console market tied up, but they will need to consider creating a software app in the near future to keep their niche. I can't imagine walking around with a phone and nintendo in my pockets, though I am sure that is trend amongst younger gamers.
The consoles took a big chunk out of the PC gaming world when the Xbox and PS2 were dominant. I can remember a good two year lull when nothing promising was really released. There was a smaller blip this time because the Xbone and PS4 are basically PCs.
VR is going to be a change, but in these early versions I don't see a lot of adoption due to the expense. Really need about $1500 just to get started. It should be very interesting in gen 3 or so when it becomes quite affordable. (And another generation of consoles is out)