There are some things that were not available 50 years ago. Better robots, better accumulators, flying drones, image recognition, AI able to make complex decisions. Those things might reduce need in humans and humans are not cheap.
Already, wheat fields can be tilled and harvested by autonomous combines. Direct human labor is basically down to picking fruits and vegetables. Most of the time, it's going to be cheaper growing something outside, in the sun and dirt that's already there.