I think really it's stalling because it's not really seen as a mainstream way to play your games.
I guess most people playing VR will play it only occasionally and for shorter periods of time.
That's my personal experience anyway. VR is maybe 10% of my total gaming time.
With PS4 you've got the additional price. Then the additional, and quite annoying, hardware.
Then probably most players will realise that, holy fuck, you can't just jump right in and play Skrim VR without feeling a bit "off" after about 10 minutes.
I can imagine homes across the country on Xmas. Little Jimmy gets his new PSVR all set up and dives into WipEout HD. Then spews his guts all over the living room floor and spends the rest of the day in bed.
I mean, Sony have sold 3 million headsets, which is good. It's never going to match their main console sales and so investment in games for the system is going to reflect that.
It's sold as more of a "novelty" too. You play in VR for the first few days thinking "wow, this is really cool" and it totally IS really awesome but then it wears off and it's just more of a hassle than just sitting on the sofa and playing a regular game with a regular controller.
So you're selling a product that is expensive, inconvenient and uncomfortable to use and is probably going to make the user puke everywhere if they play for too long. Yeah, I wonder why it's stalling.