Traditionally open banking has been a framework, either driven by regulations or industry best practices. The fundamental concept has been for banks to share certain types of consumer data, with their consent, to third party services providers (usually fintechs).
These third party services access consumer financial data from the banks and orchestrate more comprehensive services to the consumers through an API (application programming interface).
Europe with PSD2 (now PSD3) has allowed two types of services for third party providers to use, AISP (Account information) and PISP (Payment initiation), nomenclature of these service providers also is defined by the services they offer.
Payments infrastructure has traditionally been out of the remit of these third party providers, but it seems like this is changing.
Prometeo OpenBanking has established a sub network of ~ 100 financial institutions in 10 countries in Latin America, where payments can be processed between users and merchants directly without the need of an intermediary network like Visa or Mastercard.
Folks at Prometeo seem very bullish on the concept. Fees that various networks charge to merchants and users is high and there have been many solutions (bar code, instant payments, CBDC etc) that have been deemed as the end of card infrastructure.
This may not cause the end of card infrastructure, but I believe it is an interesting concept.