Interesting interview on Nvidia's perspective on VR. One bit of information I found useful when thinking about these issues:
There are well over 100 million PC gamers in the world, so the installed base with a GPU of a 290 or a 970 is not very large. (Yes, he goes on to state that thanks to the magical powers of Gameworks VR, the number can go from 13 to 25 million, but that's unproven marketing hype for now).
If sales estimates around 4-5 million VR headsets per year will materialise, then you must see a huge upgrade drive among PC gamers for this to have legroom to grow for more than just a few years, even counting new enthusiast buyers.
By next year, when the first major PC-based VR headsets ship, there will be about 13 million PCs in the market that will be powerful enough to run VR — in the right way.
There are well over 100 million PC gamers in the world, so the installed base with a GPU of a 290 or a 970 is not very large. (Yes, he goes on to state that thanks to the magical powers of Gameworks VR, the number can go from 13 to 25 million, but that's unproven marketing hype for now).
If sales estimates around 4-5 million VR headsets per year will materialise, then you must see a huge upgrade drive among PC gamers for this to have legroom to grow for more than just a few years, even counting new enthusiast buyers.