You know, seeing this video of google glass is a crowd... We thought iphone thefts were bad? Once people realize the value of google glass, whats to stop a criminal from snatching those off the user's face? An iphone at least has the protection of your pocket. Snatch and grabbing a pair of $1500 google glasses is going to become a major problem.
It'd be quite easy for Google to lock these down. For example, don't allow a new account to be used on the device until the previous account has been deactivated by the owner. If you don't have the owner's password, it's worthless.
In short: make a proper anti-theft system and publicize it loudly. Word will get around, and there will be few thefts.
As far as i know the glasses are just one part, and there's a fairly bulky computer you'll have to have in your pocket, connected via bluetooth or similar.
It piggy-backs off of your phone's data connection or wifi - there's no cell radio on it. Unless you're around open hotspots all the time, having a smartphone phone is going to be required.
I'd hardly call modern smartphones "bulky" though..
