We won’t need them to work the land. And we will starve them as they’ll no longer be needed. There will be two classes. The ruling class, and the maintenance class. And it’s timing is perfect considering that in about 100 years every population model says humans will go from 10 billion to less than 1 billion as quickly as our population grew. And it will coincide with extreme scarcity due to climate change. Unless we start nuclear war first, of course.