My job didn't exist when I was in school.
That's the critical point though - you were at school, not already working.
Having lived through this type of change a couple of times in my life it's not as simple as "get a job in the new thing". The net effect is that the old jobs are replaced by new ones but at the individual level people do lose jobs and not get them back.
Workers skilled in the older technology become unemployable and young people come in at the bottom and learn skills in the newer technology.
Some manage to retrain or are able to continue as managers but many don't. Some find being an expert in the old way of doing something can actually hamper learning the new skills because the tendency is to see it as "a new way to do the old thing" instead of "how to do a thing", which is how the new people learn it. And even the ones who do reskill have to contend with agism and the challenges of going back to entry level wages.