Bitcoin transfers even between countries on average the administrative costs are very cheap. Obviously more profitable than banking transactions, the administrative costs of which are still expensive.
I hope that all banks can see opportunities for Bitcoin to be utilized.
Some are already getting this this about the fees and yet don't want to take the risks full crypto adoption involves, so they offer rather weird solutions. There's a good example, not bank-related, though. IBM will accept blockchain, but only as a mediator. There's a person in some country, selling local fiat for btc and sending it to IBM to purchase stuff. IBM then sells btc for the fiat they prefer. Banks could do the same thing, but I think that requiring ID and fully adopting cryptos is a better solution. It's just that nobody wants to say goodbye to fiat.
That's a nice solution for mass adoption. It would really lessen waiting time for overseas transfers and be a win-win for all the ordinary people and the banks.
I would not want for fiat to be gone also if the can work hand in hand, then I don't see any problem with that.