I took a "smart phone application development" class in 2005. Nokia donated a bunch of new devices to my University and we collectively implemented half a dozen or so prototype apps. Everybody knew smart phones would be big, and looking back now, the prototypes were highly predictive of where value would be created later (coupons, gaming, photo sharing). But it wasn't until the iPhone came out years later that the market was ready. I think VR is in the same boat. It's hard to know whether the breakthrough device is 2, 5, or 15 years away, but I'm confident we'll know it when we see it.