Won't it become much less obvious when people are filming via google glass? As recording devices get smaller, and less obtrusive, and turned on without notice, how will we know when we are being recorded? We don't always know when we are right now (by random strangers). This is a particular concern for women and children, who's everyday, ordinary activities can be sexualized and uploaded to the Internet without their knowledge or consent, even now.
And what batteries will be powering these always filming google glass headsets? I would love to get them in my laptop! No I don't think Glass will change the scene much. Of course battery life will limit the filming capacity of the headsets and so will the need to speak or tap the headset to begin recording.