Ok, so what other mainstream product/technology went through a similar evolution as you claim VR is doing now? Recall 2 things:
1. VR has been tried in the past and went nowhere.
2. Adoption of mainstream things is usually pretty steep (cell phones, PCs, TV, Internet access)[1]
If you're saying current VR hardware are the "mainframe computers of the 60s and 70s" and we're still yet to see what the "personal computer of the 80s/90s" will be for VR, I can maybe buy that but I still have unanswered questions and would bet against it.
Also, current VR is also an add-on to a commodity product (PCs and gaming consoles).
You say niche for half a decade ... he says an "explosion" in less than 2 years. I don't get it.
[1] http://imgur.com/a/dr5rQ