I recently have Samsung Gear VR and there is no way VR isn't the future. I haven't watched a single "regular" porn video since though content so far is too straight and narrow for my prolonged taste in many ways and with no JAV unfortunately.
The producers are basically virtualrealporn, Badoink, naughtyamerica and not much else. All of them to their credit, or the medium if you will, have produced some great stuff that gives you an unique experience but also plenty of duds which aren't that interesting beyond initial wow effect. They're definitely improving though.
But with how much, different jav producers have gotten out of regular POV it's a shame that they aren't on board with this since what they could do creatively would push most of what the current western producers doing out of the park.
And then there are the amazing idols working the camera up close, personal and flirty. In my mind that is made for VR and should/could be absolutely fantastic. They're so good at the things that many of the western directors/models aren't coming up with yet for VR.
To my knowledge there is one japanse vr movie
http://www.dmm.co.jp/en/digital/vr/ which may have been linked already but it's not really the direction most will enjoy I think going for voyeur/360 over 180 pov and real immersion.