There once was a job called "elevator operator", the wikipedia page is fascinating [1], I had no idea they were in existence until the 1970s, I thought it ended in the 30s!
One day we will look at warehouses where robots pack boxes and think "how strange that people used to do that job, how mind-numbing and boring it must have been".
I am not going to pretend to know what employment current warehouse workers will transition to in the future, but I'm hopeful because
1) we have a shrinking world population, so there will be less people to fill certain jobs
2) we've always had improved quality of life for most people as a result of technological change - this could probably be debated, but we have longer lives, excess food, etc etc. We live in a world of excess - that doesn't mean we can't/shouldn't improve our world, but we don't need to create "more", we need to live better.
When did I become a ranting lunatic?