While it is an interesting technology with cool potential, a lot of folks don't want to be constantly filmed by Google Glass wearers for privacy issues. Like, the thought that all that Google Glass data will belong to the NSA on a whim of a secret court judge. Google doesn't give a rat's ass about people's privacy. They just want to sell their glasses, and they'll do it. And it's their right to do so, but don't expect people to love them for it.
People are in general, morons. Worried about Google Glass? People can be recording video from a cell phone in a pocket RIGHT NOW. I walked around with mine recording for 3.5 hours just to see what it was like. (Boring and bounced worse than the Blair Witch video.) People have dash cams in their cars. People have their houses and offices wired with security cameras that do motion detection and upload 1080p high-def video to the cloud.
Every store you walk into, every car you walk in front of, anybody holding a cell phone...
If you aren't alone inside a building that you control, you have no privacy and your face can end up on Youtube at any moment. Get over it.