How do expect the machines to support our economy which is based around the buying of objects like phones, tvs, computers, coffee, food, and medicine. You need money to buy those things, and to get money you need to work. Yet you can't work if robots have taken over everything. The economy would tank or we would live in world were only the top 1%, a few programmers, and a few technicians would be able to live decently. Sounds like Marx's version of a dystopia.