As for personal issues with notifications: You can just turn them off. I only get notifications for email that my filtering system can't handle, which means the sort of stuff that I would have had to carry a pager for before the advent of the smartphone. I get maybe a half-dozen unrelated notifications a month for spam that my filter didn't catch, and that number is going down. No Facebook or Twitter. No text messages or chats. Just the important email and actual honest-to-god phone calls.
Now add in commands like, "Ok, Glass, set at-con 2 whenever I'm driving," or "whenever I'm in this building." And a person's distraction levels can be overall reduced by this device rather than expanded.
I predict there will be regulation of hudphone use, especially where the operation of vehicles is concerned. A notification pop-up sapping a person's concentration at the wrong moment could be dangerous.
its a little late for that.
but personally I liked getting a smart phone because it meant I didn't need to be around the computer and could still handle emergencies or react to opportunity. or just keep connected with people in different continents while walking through my city.
I think these devices are the gateway to getting away from the Television and a Typewriter interface. Its a way to get back to being present but still getting the advantages of being connected.
This scares me. I mean, notifications are already known to cause a great amount of problems, it is changing our brains, making our attentions spans shorter and more frail, I already hate even the fact I am carrying a mobile phone, it disrupts me, take away my attention from what I should be doing... SMS to me is even worse, it is very intrusive, distracting, and now that I got used in talking to girlfriends with SMS I noticed that I am getting "addicted" to devices, instead of people.
To me, Google Glass, and similar technology, is awesome, neat, interesting, but dangerous, very dangerous, it might have very serious consequences on how we work as biological beings.