Smart glasses were a gimmick back when they were first designed and implemented in the 60s/70s, and they will continue to be a gimmick, especially if G takes them on.
Nothing against North in particular, I just think that it's a recipe for disaster to have every minute of a human's waking life tracked by Google. Color me a cynic, but I'm not optimistic about the future of this technology, especially in the hands of big G.