Pokémon GO plus HoloLens and/or google glass...
Augmented reality is *this* close.
Read Niven's Dream Park series of novels if you want to know where we're going to be going with augmented reality... The book relies on projected holograms for the story to work, but we're pretty close to the level of technology required for a dream park experience with wearable HUD displays since projectable holograms don't work in real life (yet). I think 2 or 3 of the dream park books use wearable see-through hud style displays instead of relying just on projected holograms, to individualize what the gamers see based on their character's unique skills. We can do that already with tech like google glass and HoloLens, its just still too bulky for people to wear it around.
I do think however that with the continuing miniaturization of computers, we're only a couple years from large-scale augmented reality enhanced LARP gaming events using wearable computers becoming mainstream. Essentially the kind of stuff you see with pokemon GO, but for any game genre you can imagine and with ubiquitous multi-player features. The computing power in one of those little compute sticks, tied with a lightweight Kinect-style multi-spectral set of cameras on each player, enhanced with positioning sensors, cameras, and microphones scattered around the gaming area, is already more than enough to enable a really engrossing augmented reality game pretty much anywhere. What is missing is the software and a wearable HUD that isn't so bulky. I'm hoping the position sensors and display tech that went into the second-gen F-35 helmet makes its way into the consumer market soon, since they have done a LOT of work with really accurate positioning sensors to eliminate display jittering, plus keeping it all light enough to wear in a fighter aircraft environment.
For that matter, pokemon go is nothing more than an augmented reality LARP, even if a "real" gamer won't want to admit it.
A cellphone where the computing and battery part is worn on the waist, and only the screen and camera is mounted on the head, would probably work pretty well as a first hack at augmented reality. You could have a much larger battery if its clipped to your waist. The camera would display the real-time video on the screen so you could wear the whole thing in front of your face and not run into things, and then the computer would just overlay the augmented reality stuff. If you have 2 cameras especially if one is IR, you could get some really accurate positioning. Sync it using existing multiplayer online gaming software tech and everyone on the same LAN could see the same overlays in the same location. The hardware is there today, the software isn't yet except for the tech demos we've seen from MIT and Microsoft.
(LARP = live action role play)
