Elon has his head in the sand about this. If you want to live hand to mouth and ask permission from the Orwellian surveillance state whenever you need to wipe your ass then sure go ahead and make work optional with Universal Basic Food Stamps! The Ai Robotics boom just means the middle class will become irrelevant. More and more people will end up homeless, imprisoned, and living on welfare.
Maybe what he really means to say is that for the wealthy 1% slave masters controlling Ai Robotics, working will be optional.