From the comments
This is from Ted Craig:
Another way to look at the effect of mechanization is to look at how it affected the other living employees of farmers. The U.S. horse population peaked at 26.5 million in 1915. It declined rapidly after that, hitting a low of just over 3 million in 1960. While it is about 9 million now, that’s because of increased ownership as pets.
I’m not saying humans will be destroyed like horses, but it raises some questions about the ease of transition.