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Fed’s new instant payment system could be trouble for PayPal, Venmo
(arstechnica.com)
This is a most excellent place for technology news and articles.
Most of this doesn't address my specific question, but this sounds a lot more like you expect a diversification/fragmentation of the credit card industry rather than the "end" that was posed originally. Regardless of transactional fees, credit cards would continue to provide their basic function of providing access to credit and people would still desire it.