I would argue Sony's investment in dedicated AA-AAA studios working on VR titles has shown the bar in terms of quality VR experiences software wise. Something PC side lacks a little in terms of big budget VR.The problem with VR is how expensive VR sets are. They will never become mainstream unless the cost factor comes down. It is easier to put big money on a project that will be available to tens of millions or hundreds (given the stance Microsoft has taken on PC) than it is to put money on an extension that may not see 10 million in sales.
Many have an issue paying full price for a console......how much more when they have to pay $400 on a device that does not gain as much in quality content?
Them selling over 4 million in 2.5 years is nothing to scoff at either especially compared the the competition which had been out a lot longer, and they handidly almost sold more then all of them combined.
VR is going to get better, cheaper, and easier to use. The new CPU'S,GPU'S that are coming out will be able to handle VR ad more affordable prices, and the new consoles will give higher IQ fidelity for VR on consoles along with the newer tech for controls, sensors that come with it.
It's still niche for sure, but it's growing, and isn't going away. It's just still germinating until the headsets can be used more seamlessly without tons of wires and more accurate tracking/control.