I'm from NYC and when during the first 4-5 months there were groups of kids and adults everywhere catching Pokémon but not so much anymore. I think it's more fatigue than anything. Just like console games. There's only so much you can play a single game before getting bored and moving on to the next new thing.
I think where AR can be useful is in home remodeling and even clothes shopping. That can actually be really useful and I think there are some apps already offering something similar.
I believe you on the gaming aspect in NYC. It's true that gaming fatigue does happen and I've seen it especially on Ingress. Last summer, in this small college town, tons of kids were playing them but this year, fewer were doing it although pockets of Pokemon Go players exist here and there in the area.
But for AR usage, I'm sure it'll be beneficial for some parts when, like you said, people do home remodelling and such. But that's probably going to be an extension of services that are out there where you can use maps overlay on AR as a live method of getting directions. But it has to be practical in use.
Just because AR is available for iOS doesn't mean that 99% of iOS users will use that technology. It'll just sit there while some of the demographics will take advantage of it. It's like I have Skype for video calls even though it's rare for me to use, I text all the time in comparison but it's there when I need to go with that mode.
And just because AR is available on iOS doesn't translate to total domination like others have rabidly raved for. It'll be sitting there after people get tired of it because Apple likes to play up the novelty card to death.