Humans are never going to be walking around with huge computer goggles on their faces, and that's because humans already do that, and it's called *cars*. Cars are a bigged opportunity for AR, and it's just a matter of doing the HUD on the windshield properly. You have everything you need: established adoption, plenty of space for a beefy CPU/GPU, and people get bored in cars, or waste time. And virtual billboards shouldn't distract drivers any more than actual billboards do.
@staltz LOL I walk around with goggles strapped to my face and code using a mini keyboard. I'm pretty far from the definition of human though. Personally AR that magically overlays stuff is overrated, just having windows floating in my field of view has been great.