https://fred.stlouisfed.org/series/WM2NS
Nothing can grow exponentially forever. Any guesses as to when this chart goes to singularity?
It turns out humans are just not good at running their own money supply. This has been true throughout history, even with a gold standard as coins were frequently debased. In current times, this chart of federal reserve assets is illustrative of the current environment:
https://fred.stlouisfed.org/series/RESPPANWW
The growth in that chart since 2008 is new money that was created not by banks making temporary loans but by the central bank outright printing new money and injecting it into the economy (QE). If the FED balance sheet shrinks the stock market will crash and there will be irresistible political pressure to do more QE.