Eventually, loose monetary policy will damage real savings to the point that the economy can no longer sustain sufficient economic growth. At that point, it will become clear that money printing can't create economic growth.
Just how is this magic created? The spurring of demand in the midst of a covid-created depression. The wizards at the Fed and Treasury have created an intoxicating frothy brew for stock and home buyers alike.
Economic growth results from increasing production, and the money supply is always sufficient to foster exchange. The boom-bust cycle only occurs when production is distorted by a growing money supply.