Humans as a species are pretty resourceful, but individual humans often not so much.
The problem is that throughout human history the demand for unskilled labor has exceeded the supply, and that has been the foundation of our social contract: work, and you eat. Don't, and you starve. But some day soon, technology could make that assumption no longer true, at which point we could have big problems unless we radically rethink how our society is organized. That is something we humans have historically not been very good at.
Re:Jobs that no longer exist
by etqwzutewzu on Sunday October 16, 2016 @09:37AM
(#12718532)
Look back also in the early 1900s where all major newspapers were proclaiming the end of world and massive famine if we ever reached 1 billion people on Earth"
"It is estimated that the population of the world reached one billion for the first time in 1804." Source: https://en.wikipedia.org/wiki/Population_milestone_babies
So, let's not fool ourselves with predictions. We are notoriously bad a predicting long term trends.
PS: the analogy with horse is wrong in so many ways (because horses are not humans and cannot adapt like humans) but this would be another topic altogether.