Look at the disappearance of pink-collar jobs due to computerization and "do it yourself" that it enabled. There's lots of examples of whole career fields disappearing. The trick has always been to see whether and how things reappear.
University graduates are often considered min-bar for white-collar work hiring, so if it takes 4 years to train someone, how are people supposed to decide on a career path when it takes less time than that to completely alter the workplace?
My daughter is entering her first year of nursing, a career path that she is greatly looking towards. Who says in 3 years that robotics companies don't actually deliver on their promises and completely up-end the care industry? While I think that unlikely, it's not like people aren't trying to automate nurses away.