This is definitely a good critique. I remember when I got an iPhone in 2007, people always wanted to talk about how I had an iPhone (they were still very uncommon, I think I was the only one at my school to have one for a time). I can't imagine how awful this would be with something that wasn't meant to be in my pocket for most of the day.
Correct, technology like Glass has to be socially acceptable before there can be adopted by the masses. It's a chicken and egg problem but then again I've never used a Bluetooth headpiece.