To judge the potential of AR based on today's tech is like handing someone a Palm Pilot, and saying "why do I need a smartphone? The touch screen is terrible, just give me buttons. The apps are poorly designed. The internet is limited. I'd rather just use a PC." I looked at those terrible Palm Pilot devices, and I always thought "If someone did this right, it'd be amazing!" The potential was always there.
AR/VR is cumbersome, uncomfortable, and unenticing... right now. But AR is all about the untapped potential. In its ideal form, it has the potential to replace smartphones, and really all screens. Content isn't limited to a box – you don't need to own a big TV, when you can just put an IMAX screen on your wall. Or navigation overlays, or browsing the internet, or checking the weather. Almost every app on my phone, I could envision a better version in AR that's just part of the world around me, rather than looking down at my screen. That's the vision, and a use case I'd put on the glasses for.
Lots of hurdles to overcome – WAY smaller headsets, apps, the entire ecosystem needs built. I'd give it 10-20 years... but to me, mass adoption of AR is inevitable. It might take a generation, but it's gonna happen.