I think this is misreading Google Glass. People didn't like or want to use Google Glass because there was no "killer app" for them. There was no useful app for Glass at all so far as I am aware. Had Google Glass enabled something new and useful people would have worn it regardless of how different it looked, and because people found use in wearing it we would get used to it.
Headphones are an example of this. Headphones would probably look goofy if you weren't used to seeing them. People wear headphones anyway because headphones deliver something useful to the wearer - private audio.
If I had to wear a silly hat, but in exchange could carry around a meaningful brain-computer interface, I absolutely would, and, assuming "meaningful" in a broad sense, I'm certain huge numbers of people would as well.
Right now people are struggling to make the tech work at all. Worrying about the form factor with which it will be delivered is premature - it can't really do anything yet. Once it's useful it will need a good form factor, but the use will drive adoption, not the other way around.