> Economists have discussed it, and just like with previous automation, there'll always be new job

Past performance is not indicative of future results.

> human wants are unlimited

Physical resources are limited, and producing work requires the allocation of capital. If people want to work but cannot access the basic tools and resources to work then they'll languish in unemployment. Society doesn't just default to a productive society with high employment; these conditions need to be nurtured. Given the current state of economic inequality we're trending away from conditions that will lead to full employment if AI wipes out large swathes of jobs.