Should human beings be replaced by robots?

Watson defeated Jeopardy's best. Robots do not need health care. According to most atheistic Liberals, we do not even have souls. Wouldn't the most prudent answer be just let man die off and let more efficient machines resume in place of humanity? We can teach them to repair themselves and make newer, improved machines. This could be done in a matter of a couple decades-long before man's global warming destroys us all.