Unaccommodated branches

I was riding the bus today, and accidentally, I listened to a conversation between two 18-year olds talking about their future. One of them said how it is important to get a very targeted kind of education so you can get a job you'll really enjoy in the future, while the other one mentioned that an all-round education would be far better. It made me rethink the whole educational system for a moment. Those who specify themselves in a certain branch would obviously find themselves out of work if the branch would cease to exist. In fact, this has happened before, and will likely happen again.

Assume you’re going to spend a few years in school for the sole purpose of becoming a hairdresser. What would happen if someone developed, say, a helmet with the possibility of automatically cutting your hair as soon as you put it on your head? What would happen to all of the obsolete, 50-year old people in this branch, who are all too old to get a new education of some kind? Of course, on top of this, they’re likely too inveterate to change their minds. Would they automatically disappear off the face of the planet due to the fact that they’d become social hogs, getting free money off the taxpayers?

The way I see it, keep an open mind about everything, and always keep a secondary door open if things would go wrong.