I think you wanted to use a term other than de-leveraging there. Perhaps you meant to say a huge exodus from financial markets? But then we could have evidence that this already happened with many american CEO's dumping large portions of their stock holdings?

If I remember right, the 2008 economic crisis was caused by banks having many leveraged positions, they couldn't cover related to subprime mortgage debt CDOs. There were reports of subprime mortgage being only 15% of the derivatives positions banks couldn't cover. And so the state bailed them out and covered their bad positions, so banks could continue business as usual.

There is definitely no shortage of doom and gloom as far as financial markets and the economy go.

One example of this is the "bitcoin obituaries" webpage which references 416 times bitcoin has been declared "dead".

https://99bitcoins.com/bitcoin-obituaries/