I think you're wrong in saying there's a limit when it comes to AR.
Our smartphones are AR devices, a poorly interfaced cybernetic extension. It's a cumbersome device yet unimaginably successful.
This poor AR device has constraints that will always hamper it. It must be of a certain size to display anything useful/readable and to be a useful touch-operated device.
If people put up with this poor device and it's slow information delivery, due to the poor human-computer interface, then they sure as hell will put up with AR devices of the future.
This new wave of AR need not have near as hampering constraints.
AR has the potential to be more successful than the modern smartphone when products are as uncumbersome, lightweight and comfortable to wear as regular glasses/sunglasses, while having the technical specs to augment reality with razor sharp and useful 2D and 3D overlays, and sound.
I see no reason people will be more reluctant to put on a pair of sunglasses than carry an iPhone in their pocket or purse.
Then there are other AR product forms, like contact lenses.
AR has a wide host of useful applications, both civilian, social (recreational), military, engineering, medicine, etc. That's not the future, for most of these branches it is already in great use. There's a ton of R&D going on in this space.