The problem I think of is getting the customers to use this. If you can entice your customers to consistently use this rail, that's awesome. No idea how you'd do it other than increasing costs to pay via CC. It seems like it also targets digital payments and isn't too focused on in person transactions (e.g. grocery stores).
Windcave Account2Account is not a full replacement for debit/credit cards. It does not have PayWave (solvable). It has a clunky UX (solvable). It does not do credit transactions (not solvable).
It can be a minor headwind to VISA/Mastercard and slightly reduce their new signups and tx volume, but I cannot see it fully replacing credit/debit cards.
> FedNow payments will operate year-round for businesses and individuals. Since funds will transfer and settle instantly, all payments are final and cannot be reversed.