There was an image on Reddit a couple years ago of a whole bunch of dudes with bluetooth headsets. It was captioned with "I think aliens are secretly tagging douchebags and releasing them back among the population." This X10.
Honestly, the aesthetic doesn't bother me too much. And it's a hell of a lot better than every lab prototype I've seen that bulges out 2 inches from the head. It's the $1.5k price point that's the deterrent. Under $200, it's a toy. Above $1k, it's an aspirational lifestyle accessory. Then again, I don't bat an eye when I meet a lifelogger. I idealize a world of wearable computing, but to date, most uses of them seem to err more on the side of distracters than optimizers of one's life.
That is the biggest obstacle here by far: Who will be willing to wear it casually, and how will that feel to those about the person wearing them? All of the video was from the wearer's perspective. They never showed someone talking to their Google Glass from a bystander's perspective. I think Apple will have more success with adoption of their watch.