This seems like a perfect opportunity for a common good. Something to make transactions easier and cheaper and help keep the economy running.
But that would be big-government-communism-anti-jobs-whatever-people-are-mad-at. So that’s not how we do it.
We’re getting FedNow (eventually). Seems like you could built a debit card processor on top of that.
You may still need Visa/MC/whatever for international customers to use debit. But American has a lot of Americans doing debit from American bank accounts.