It's always been an interesting topic. Would you wrote out on or not? Interest in braces aside, would you really want to wear it? Have a sibling wear it?
I think you have to look at how braces have developed over time, and think of the things we wouldn't do now. Even full bands would be pretty barbaric in the days of ceramic brackets. Headgear at all seems rare anywhere outside of the Netherlands. Likewise, in 50 years time, will we think drilling little screws into people's gums is a good thing to do?
Does anyone do it now? Almost certainly not. Did anyone do it back in the 60s or 70s? Perhaps some did, or at least it was considered a plausible enough threat to scare people into behaving. I think it might remain one of the great mysteries...