For decades, emergency liquidity through the FDIC has been the norm in US commercial bank failures. The core of the 2008 crisis though involved Wall Street investment banks that were not chartered as commercial banks, so the policy innovation was in providing emergency liquidity based not on a system of deposit insurance but on Wall Street's systemic importance and to prevent failures of insurers and pension and investment fund in the US and Europe.
Over the last decade, I have gradually come to the opinion that our money should be inviolable. That is, no politician may have the ability to debauch it for any reason.
Banks must stand on their own and suffer bankruptcy [with all its attendant negative effects on the depositors] just as any other business.
Only the market may influence its purchasing power.