There's a huge difference between the government spying on its citizens without their knowledge and citizens recording others. If I knew that constantly being on camera would be inevitable in the future, I would definitely choose Glass over CCTV and the NSA.

David Brin puts it best in The Transparent Society (which I would strongly recommend to anyone concerned about privacy):

"We may not be able to eliminate the intrusive glare shining on citizens of the next century, but the glare just might be rendered harmless through the application of more light aimed in the other direction"