Will take at least 10 years for it to take off globally; And it may very well never get there. A few bunch like Luckey Palmer will get rich like he already did, but that’s all for a long while…
Until we have internet good enough to run the merge of VR to streaming services like what Shinra is building 
For that happen, all you need is give people access to cheap fiber network then headsets will be hundreds of times cheaper to manufacture and the masses will finally buy into the idea.
The hardware as it is now, outside financial elites, it won’t sell at all. The reason why I’ll be a lazy very late adopter of VR development, for me there’s no point in running into that right now.