There has to be a tipping point when enough jobs are done by machines that there are not enough wage earners to buy products and services created by these machines. At that point a choice must be made, to either take the machines and lock them behind secure walls to only be used by the privileged and leave everyone else to squalor, or to fundamentally change the structure of society where work and money are no longer core elements. I've got my bets on which one will occur.