The fact that you'd have to a own a large town/large plot of land to build a town on for that to work fluidly with would probably put off devs more than anything (maybe Disney could do something with their parks). Not to mention the awkward factor people would be considering, there's a big difference between larping with VR/AR helmets and swinging imaginery weapons/slinging imaginary spells and tapping on a phone in different places to catch a pokemon. Also AR is unlikely to be the future of gaming, it'll likely be a revisited gimmick every time someone has a cool idea that would work well with it but nothing really major like Modern Warfare Zone or something. I mean AR tech has been properly around since the PS3 with THE EYE OF JUDGMENT™ game and nobody has really done much more than that and using AR cards.