My guess is that banks will eventually use something like Fedimint or Fedi itself. It seems like a good fit for how banks work from what I can tell. And I do think most people will gravitate toward custodialish solutions like that.
Discussion
Killer use case is building a national digital currency.
Would certainly be interesting to see how that affects Washington’s private banking clientele.
Private banks can all be part of a federation and continue to produce debt based currency. Ecash is very useful for upgrading our current fiat system. For bitcoin it has weak anti-regulatory properties.