This guy is missing something and a bit myopic. The Visions real vision is convenience. No more holding the phone to absorb content, everywhere entertainment, immersive experiences, everything always available. The device is no where near the ideal form of just a light weight glasses, or even contacts. Between here and the future it will get more and more portable.
I just don't think this is DoA because Apple fans buy any crap Apple releases, no matter the price. It will become a nice iPaperweight though.