Who said anything about low end CPU, low end GPU or 6 years? The most recent rumours put the next gen consoles as launching in 2018, 3 years from now. And neither the GTX 970 or the i5 4590 are anything close to low end, and won't be by next year either. My CPU for the record is coming up to 5 years old now and is still going very strong. It's pretty much on par with the Oculus min spec and if required could no doubt see out the rest of this console generation with ease. As could my approaching 4 years old GPU for that matter if it weren't for the Oculus min spec.
Why 6 years? If the next gen consoles launch in 3 do you really think Oculus (or some other PC headset) will lag behind by another 3 years? If I even bother to upgrade my CPU this console generation (it's coming up to 5 years old now and still pretty much on par with the Oculus requirement) then it would likely be to at least a 6 Core Broadwell. I wouldn't be at all surprised if such a CPU were on par with the minimum spec of and Oculus 2 meaning that all I'd need to upgrade would be my GPU. Which going by the min GPU price for Oculus by the time it launches should be around £150. Even with a full CPU, MOBO, RAM and GPU upgrade, the Oculus minimum spec would cost a little over £400 by mid 2016. Or about the launch price of a PS4.