Thanks for posting.
I don't know who said desktop systems need to be more powerful than consoles because they have more "overhead". This just isn't true. Since they're a fixed hardware spec, consoles get away with being weaker because developers can tune the games optimally, for them. That, and PC games tend to be more cutting edge. Plus, PC users tend to do things like running higher-res displays and cranking up the quality settings beyond what the consoles use.
Neil Trevett was exactly right, when he said mobile is limited by heat (and battery?). Desktops will be the VR platform of choice, for the foreseeable future. Not only because they can run much more powerful CPUs and GPUs, but also because it'd be a pain to lug around all the accessories (cameras, lighthouses, controllers, HMD, etc.) you need for the best VR experience. Eventually, AR (or using AR hardware for VR) might largely displace VR. But that'll be a while.