You could read The Long Twentieth Century by Giovanni Arrighi.

Fiat money is not the problem, the financialization of economy is actually a common by-product of aging great monetary powers. The US chose to become a monetary power in 1945, rejecting Keynes' Bancor proposal.

Then in 1971, it found it couldn't keep it working, due to the very reasons Keynes explained to them at Bretton Woods. Arrighi argues this has happened 4 times already.

So Fiat money and the financialization of life is just an outcome of something else - that being a monetary superpower is just not sustainable.