No existing or imminent VR hardware is good enough to go truly mainstream, even at a price of $0.00. You could give a Rift+PC to every single person in the developed world for free, and the vast majority would cease to use it in a matter of weeks or months. I know this from seeing the results of large scale real-world market testing, not just my own imagination – hardcore gamers and technology enthusiasts are entranced by the VR of today, as am I, but stickiness drops off steeply outside of that core demographic.