I think the problem is that merchants hate the card networks and consumers generally like them and there are a lot more consumers than merchants. If you are a politician, which block of voters are you going to side with?

It is the difference between Credit and Debit cards.

I could see Debit Cards being replaced by direct transfers.

The issue is what happens if who you pay too does not provide the srvice or just runs off with the money.

Under UK Law the customer can deal with the Credit Card issuer and get their money back with a direct payment it is npot always possible.

For debit cards I think the issue will refund if fraudelent but might take a battle. With direct payments the customer has a much harder job.

I've noticed growing use of similar options in the UK already, like Payit and truelayer (often shown in checkout via "Pay by bank"). Ebay and Whetherspoons are examples of places providing these options.