On the contrary, I think that is exactly why post-scarcity is going to devour the economy. Think about what happens when access to medical care and housing become the scarce resources, when it becomes pointless to buy more consumer goods because you have nowhere to put them anyway. More and more of the economy becomes diverted into the pockets of those who own real estate and the medical industry. Improvements in efficiency elsewhere just make the problem worse further damage those industries. An increasing portion of our economy gets siphoned into the pockets of a rentier class with little reason to spend it.