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.