There were a lot of job and opportunity revolutions in history. Many people lost their job when land was used for cattle breeding instead of planting. They found new jobs in industry (of course dangerous and underpaid). In factories man's labor started to be replaced by machines, the production was cheaper and many craftsmen lost their livelihood. In days when AI starts to be common part of our lives many jobs in industry or care of patients, guests… will be endangered. I am sure that there occur a lot of new possibilities for humans' jobs.