I'm not convinced that VR/AR will reach the parks for a very, very long time. Right now, those technologies are squarely in the tech company world (Google, Facebook). I mean, Pokemon Go was built by a Google spinoff. VR / AR will need to be a lot more approachable and a lot more stable before they'll be theme park ready. In the end, Universal is theme-park cutting edge. They aren't going to be spending time + money developing VR tools so they can build a VR ride. They'll wait until the technology has matured enough for VR tools to already exist. They'll wait for somebody to build hardened VR / AR hardware that can be used in a theme park setting dependably without having to have software engineers keep pushing out bug fixes.
It's gonna be a while.