I would expect the ratio of console HMDs to PC HMDs to rapidly approach the ratio of console gamers to PC gamers. I'm hoping the VR edition of Fallout 4 pushes VR into the mainstream.
And it sort of bums me out because it feels a bit...lazy? short-sighted? FPS in the way we think of them now were uniquely suited to a flat screen in front of us. They offer a sense of freedom of movement that is great in games. But trying to shoehorn that old approach into VR seems like missing the point.
I think the real trick (at least as demonstrated to me by the 100 or so games, applications, and demos I've tried on Rift over the past couple of years) is to find formats and conventions that are uniquely suited to the platform rather than trying to rehash and cram what's already a big seller into something that doesn't make you puke after an hour.