So, there is a flywheel coming up to speed: FedNow [1]. I beat this horse to death here [2], but only because it is so revolutionary (for US financial infra). It catches us up with 54 other nation states with instant payment systems. It removes credit risk from delayed settlement, checks (and the risk that goes along with paper instruments), the need for a deposit account to underwrite you (if they simply disable any ability to go below $0). It's run by the Fed as a cost recovery utility, not a for profit enterprise to squeeze as much profit from as possible.
There are already 400 participants who have signed on in less than a year of the network being live [3] (the list includes Chase Bank and the US Treasury), and the CFPB is already getting in front of financial institutions attempting to charge insufficient funds fees for instant payments when unnecessary [4]. There are substantial entrenched interests fighting it (The Clearinghouse and their competing private RTP network, credit card rails, etc) due to the revenue at stake (~3-5% of the economy running through this FinInfra), but as long as the infra uptake continues and it isn't sabotaged by policy and lobbying, it will deliver more efficient value transfer at scale. Also helps when merchants surcharge credit card rail payments when cheaper alternatives are enabled.
Tangentially, the unbanked stand at ~4.5% in the US per the Fed [5]. That should be driven to as close to 0% as possible, which instant payments contributes towards (getting funds to recipients faster with less float and necessitating less or no credit extension, depending on use case).
[1] https://news.ycombinator.com/item?id=36801491
[2] https://hn.algolia.com/?dateRange=all&page=0&prefix=false&qu...
[3] https://www.frbservices.org/financial-services/fednow/organi...
[4] https://www.pymnts.com/news/cfpb/2024/cfpb-proposes-banning-...
[5] https://www.fdic.gov/analysis/household-survey/index.html
[6] https://en.wikipedia.org/wiki/Unified_Payments_Interface
[7] https://en.wikipedia.org/wiki/Pix_(payment_system)
(humorously, you mention it's very "Indian" when UPI [India's instant payment system] is probably the gold standard success story [6] alongside Pix [7] in Brazil)