This has been going on ever since humans started thinking up better or different ways of doing things. Maybe we don't need as many money managers and brokers doing work that is done cheaper and better with technology. We will still need some, but not as many. There will be new areas where smart, driven people can make a great living.
Edit: One other thing to think about is how drastically automation could reduce the cost of living. In 1928 "A chicken in every pot and a car in every garage" was a campaign slogan. In 2016 where you can get a whole uncooked chicken for a few bucks in a grocery store it seems quaint that this resounded so heavily with the general public in 1928.
Sure! Now then, whose land will you be hunting/gathering on? You'll most likely have to pay for access to someone's land, and they probably won't barter access for chickens/goats.