I think YZF's edit is a very good point. VR does not have to deny the reality that is still there. You could include an image of reality within the VR environ

I think YZF's edit is a very good point. VR does not have to deny the reality that is still there. You could include an image of reality within the VR environment. If you stick two video cameras and have a realtime feed to an oculus rift then you would essentially have AR in a VR headset (assuming the video feed is not perceptibly delayed 60-120 Hz refresh or less than 10ms frame-to-frame delay). Then again with AR apparently you can make the image bright enough to occlude reality (however you couldn't have a dark room as the augmented reality). With the inclusion of reality in VR I think you could essentially emulate the hololens and what you could or couldn't do between the two would be blurred.