That's at least more of an argument than "it never happened before so it cannot happen in the future".
Money cannot disappear, but circulation can be confined to ever-smaller segments of the economy. Let's assume a world in which AI is good enough to do 90% if all white-collar jobs and companies have replaced positions with AI accordingly. Then the amount of money that entered the wider economy through salaries will now stay locked up in B2B transactions between AI companies, their corporate customers and their contractors. How will all the laid-off people get money? Some would probably get into blue-collar work, others will try their hand starting a business (that will also compete with AI), but all of them? What will happen to the businesses that were relying on those employees as customers?
Money cannot disappear, but circulation can be confined to ever-smaller segments of the economy. Let's assume a world in which AI is good enough to do 90% if all white-collar jobs and companies have replaced positions with AI accordingly. Then the amount of money that entered the wider economy through salaries will now stay locked up in B2B transactions between AI companies, their corporate customers and their contractors. How will all the laid-off people get money? Some would probably get into blue-collar work, others will try their hand starting a business (that will also compete with AI), but all of them? What will happen to the businesses that were relying on those employees as customers?