FDIC is backstopped by the Fed and participant banks. There is no hard limit anywhere. Make depositors whole, good luck to everyone else. If you’re exceeding FDIC insurance limits as a depositor, you should fix that, today. If you have exposure to at risk asset classes, you’re already exposed, you’re just waiting for prices to catch up to reality.
how do you fix it?
If you're a larger business (>$5M cash equivalents on hand), treasury management in government money market funds instead of a demand deposit account. All roads lead to mostly US treasuries here.
[1] https://www.fdic.gov/resources/deposit-insurance/brochures/i...
[2] https://www.fidelity.com/why-fidelity/safeguarding-your-acco...
(previous comment on the topic during SVB failure: https://news.ycombinator.com/item?id=35171289)
If your risk model is the US government allowing FDIC to fail, we're well outside of reasonable discourse. Your currency would be food, fuel, and firearms.
When the problem is too many loans 'how do you still let people get loans' is not the right question to be asking.
Reserve rates have been 0% since 2020. All Deposit taking institutions with a loan department have carte blanche to print money. The model you're operating under doesn't actually map to how things are now.