I bet every real estate agent in the world would like one of these hooked up to a database of houses for sale, so they could instantly scan all the relevant information.
Is a smartphone with GPS not able to do any of this? How would Google Glass be anymore accurate than a GPS to be able to overlay the information properly as opposed to an "AR" app on a phone?
Maybe it could be useful for some things, especially games, but even in that situation, not having a HUD or anything distracting on the screen is seen as a benefit, so why would you want it IRL? Maybe it could be arranged into something more useful to you personally such as widgets on a desktop, but I can whip out my phone and check a few quick things already.
I just don't know if I want to always be seeing data. So it'd be easier and cheaper to whip out a smartphone instead of taking out my smartglasses and putting them on.
Our OS who art in CPU, UNIX be thy name. Thy programs run, thy syscalls done, In kernel as it is in user!