No I don't think he meant bank supporting crypto is the way but rather than the economy system where regulation policies and market manipulations had been thriving on appreciating recessions.
Obviously the CBN has lost it reputable qualities on printing excessive monies for cash cushion and as it's, the fiats has lost it value so whalers are diverting to have their fund stored in bitcoin as store of value which is a reliable source rather than say it's crypto.
Fiat currencies will never be equal to any cryptocurrency especially with Bitcoin which generally has a limited supply limit so banks will never be able to work with a system like Bitcoin because even if banks want to develop their digital currency, it will never be the same as Bitcoin and other cryptocurrencies. I also agree with what you said that fiat currencies have lost their value in the eyes of the public since many people know that fiat money can be printed as desired by the country's leaders. So investors or anyone else should not expect much from fiat currencies except for just a means of exchange.
Fiat is what we can't stop using, governments are the ones backing fiat as long government remains, i doubt if fiat can go into extinction. Banks won't go into extinction no matter how populated Bitcoin becomes, there is a purpose why Bitcoin cannot replace them totally, controlling the fiat system is corrupt and those in possession are not ready to let it end in a bad condition.
Banks creating any digital currency is the worst mistake they could make, why leave decentralized Bitcoin to invest somewhere same managed and manipulated by the government, there are many factors to consider and security is one among the mentions, government no matter how they develop remains what they usually are, i don't trust my funds with them in regards to investing in their currency if they do.