[nooneelse]

I think some sort of concept of "attention-condition" levels could and should be applied. These would be like "def-con" levels, but labeling the readiness of one to switch attention, instead of readiness to engage in military action. Saying something along the lines of, "Ok, Glass, set at-con 2 for the next hour," could do things like switch notifications to only a whitelist of people and message types. "At-con 5" would let everything through. "At-con 1" would only show you something from an even more restricted whitelist, or if a nuclear war started. ;-)

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.