I have a bluetooth headset for making phone calls more safely with my older car (not capable of interfacing directly with my phone), and I don't agree with demonizing headset users, but the biggest issue that I personally found was related to the fact that the headsets were hard to see. Making it unclear when someone was talking on a call or to those around them. The headphones with mics, I find them to be less of an issue because they are more visible even though it would seem to present the same opportunities for confusion.

There was a time when vision correcting glasses were considered very strange I would imagine, but they proved to be very useful and we become accustomed to seeing them. What will be fun, I think, is as others have postulated wearable tech becoming less apparent to the naked eye, so much so that the plastic brick will be considered odd, and that one would WEAR vision correcting lenses mounted in metal or plastic frames right on the face?!