Well, you as a human train and live as a human on the output of all human civilization and if you are very efficient put people out of work. 99% of human jobs were physical labor and now machines do the work of thousands with one human superviser (oil tanker, machine loom, dump truck, train, etc). If humans are put completely out of the loop, that is a new problem for humans (super intelligent AI that takes over will likely be very bad for us) but avoiding that problem is another ball of wax.