Why a human in a box and not an android? A lot of jobs will require advanced robotics to fully automate. And then there are jobs where customer preference is for human interaction or human entertainment. It's like how superior chess engines have not reduced the profession of chess grandmasters, because people remain more interested in human chess competition.

The assumption is superhuman AGI or a stronger ASI could invent anything it needed really fast, so ASI means intelligent robots within years or months, depending on manufacturing capabilities.