This is what a niche of a niche of a niche looks like:
From SuperData Research, for my money the best game industry analytics firm out there, an even factoring in the just-announced Google Daydream, the total install base for all mid to premium VR HMDs is projected to grow to way less than 7 million. With console and mobile-based devices, from Sony and Samsung respectively, way ahead of the Vive and Rift, which still get way more publicity.
I say this is a niche of a niche of a niche, and there's a very good reason for that:
(Via HyperGrid Business)