Which means "co-op" game play by users in the same room. That would be so awesome! Wait, I'm not a gamer anymore. Heh... I could be for something like that, though. Gives a whole new meaning to LAN party for gaming. Instead of everyone sitting at a computer, hook up in an arena and everyone has HoloLens for a seriously massive multiplayer experience.
I can imagine something like that replacing a lot of "paint gun" facilities. Wow... I can also imagine it would be a great training tool for military tactics, police training, Firefighter training, Emergency Medical Technician training, CPR classes, etc. The possibilities are endless, really.
By the time NASA buys a bunch for doing "walk-throughs" of Mars, and by the time the Military buys up tens of thousands for training, and other governments do the same, I imagine it will help to bring down production costs a bit so that we consumers will be able to afford them a lot sooner.