Ok, so we don't have holodeck tech, yet, however - imagine a headset where the following functionality exists: >= 1080p, full 360o immersion as the head and body turns and pitches, no medical issues!, fixed 2o camera projects (if sitting next to keyboard !!) hands and keyboard onto small 'window' in the VR world, or - of course - the user has minority report type interaction as well as environment & inventory interaction (still very difficult to do right in a full VR environment - not good for certain gaming styles - hence seated position with keyboard projection), etc, etc....add your own ideal functionality
There is absolutely no doubt, whatsoever, of the outcome if they get this right!