It’s really non-obvious to me that there is any advantage of crypto that makes its use inevitable in financial products. Those Australian banks - are they crypto-related products in the sense that they appeal to crypto people (maybe a way to buy or trade crypto?), or are they actually more efficient versions of mainstream products? The idea that banks will inevitably adopt crypto because their crypto-using competitors will be more cost-efficient seems implausible to me. I just don’t see the mechanism for crypto being a cheaper way of doing things.
Most banks in Australia are working on crypto related products, Visa is too. Eventually once a few have a network together, especially internationally, the snowball accelerates because of Metcalfs law and soon it's more costly to not integrate.
The way I think of it is "if we had everything running on crypto rails, would companies want to switch back to what they have now" and the answer is obviously no, so it's just a matter of time until it happens.