The only wearable headset so far has been Google Glass. It was great for wearing around 24x7 with only pauses to recharge. I even had mine in prescription glasses so I could wear them as my primary.

Then, as Google does, they dropped it, and no one took it up again. I'd have to imagine that in 10+ years of display and battery improvements an even better Glass is waiting to hit the market. It seems more a social issue rather than a technological one: we as a society are not ready for universal AR.