That's the entire point of capitalism. To generate as much profit from as little expense as possible. Unfortunately capitalism is predicated on a human workforce earning income to pay for goods and services, so at some point the economic engine will shutdown and capitalism will have killed capitalism. Either way, once the level of robotics + dumb AI is more cost effective than the available workforce in any role, that role will be eliminated. Once general AI is achieved and (especially once) the robots can build and repair themselves, the proles will either get star trek or whoever commands the killbots (including an AI) will rule humanity and inherit civilization.

NOTE: could happen at any time, but my bet's on it not happening for many decades; possibly not for hundreds or thousands of years.