I just came back from Delhi, and thought similarly (just camera specifically rather than smartphone actually) there, that I'd have loved to have something like Google Glass, but more subtle looking, for discretely taking photos without standing out so much - I missed a lot because I just didn't feel comfortable framing the shot, looking like such a tourist (I was visiting family, didn't see anyone else like that) - but of course I did look at them, would've been great to just touch the side of my glasses or whatever to take the photo.

Day to day though, as a smartphone replacement... unless/until I need prescription lenses I don't think it's enough to make me want to start wearing glasses.