All bluetooth headsets make people look like dorks, but that hasn't stopped their proliferation.
FWIW, when I was an intern at Google, Sergey wore them 24/7. He looked a bit weird the first couple of times, but after that he just looks like Sergey. It's like people wearing glasses when they previously didn't. Weird for a bit, then perfectly normal afterwards.
Wearing a bluetooth headset is not required to use a cell phone though. It's optional. Also, how much have they really proliferated? I don't see them very often in my slice of suburbia.