I can forsee the whole VR headset thing stalling. Without a ton of support, games, apps and media that are genuinely augmented by VR headsets, they could go the way of 3D TV; impractical and forgotten. Or Pogs.
I don't really game at all, but if VR porn gets good enough, I'll buy an Oculus Rift for the porn alone. I'm not convinced it's going to happen any time soon though, and it's an awful lot of money to waste. A few years ago I considered buying a 3D monitor to watch 3D porn, but then I looked a the price of the 3D monitor + glasses + new graphics card, and I was put off. Then the Oculus Rift came along and I've been waiting for the technology to improve and the price to come down. The OR by itself is expensive, and my PC would need at minimum a new graphics card and a new PSU to power the graphics card.
I suspect that the gamers who have rigs powerful enough to support a VR headset are buying them for that reason; they have no extra outlay to worry about, but it may be that everyone who can afford an OR or a Vive has already bought one, and the rest would like one but aren't willing to spend that much more buying a new high-spec computer to run it.