What we see in the banking sector is the usual reaction of banks to crisis, when banks cannot survive in such conditions, in such periods, weak links always leave the market, and it seems that this is only the beginning of a crisis.
The old generation will have to adapt to new conditions, if this happens in the near future, then they will be obliged to understand at least digital national currencies, because it can become their and our new reality.
Fiat will still be used, but investments made in fiat (like stocks and all) will not matter if this happens, and people will all invest in crypto instead of anything in fiat, which would be weird to see, not saying it won't happen, but it will be difficult.