The only reason that 3/4 (conservatively) of the population isn't walking around with their Borg implant Bluetooth earpieces these days is that, in most situations, if something is actually important someone will send you a text. And, yes, I clearly recall when being affixed to a Bluetooth earphone was widely viewed as douchey behavior outside of certain circles because it implied the person was just waiting for a call that was more important than you.

This has pretty much been normalized as more and more people expect immediate response to whatever trivial whine they have.