Seperate comment because it's a separate topic: if I was looking to make money from VR as a primary consideration (as opposed to my current cascade of story first, money second) I'd be ignoring games altogether and looking at creativity / design / conferencing apps, probably for enterprise. VR is incredible for creation and design, and can easily be collaborative too.
I think I'd focus on the education/simulation training and medical market; there's already a bit in there, but nothing crazy big that I am aware of. Think: Welding/training simulators (or tool training period) Job training (perhaps heavy equipment simulation?) Psychological/medical treatment (for instance, treating fear of heights - which has already been experimented with) Virtual Design (VR CAD/CAM, interior decora…
I was discussing VR with an ex-military colleague recently, and he got quite excited about the potential of the technology to enhance and extend early-stage simulator training. It's a hell of a lot cheaper to buy a Vive than a tank simulator.
And the therapy applications are incredibly exciting. Early days for those still research-wise, though.