What a major US Federal Regulator just announced is that all banks can use blockchains (like Ethereum) to move value, just like they use Swift or ACH https://www.coindesk.com/occ-banks-stablecoin-payments
As smaller companies now have basically no barrier to entry in the bare metal rails of payments, finally serious innovation in this space can happen outside of heavily financed / licensed / oligopolistic / connected entities. Banks can then voluntarily choose to integrate with one or more open source value transfer networks (blockchains).
Look at USDC https://www.circle.com/en/usdc This is a regulated token fully backed by audited reserves (unlike Tether (USDT)). There will be some banks, such as for international settlement, that will find this technology better than the existing. There will be some people in foreign countries who prefer a cryptocurrency wallet on their phone to paper cash USD or their (corrupt) banking system (Venezuela, Lebanon, etc.).
Even if you are skeptical of blockchain, is it clear to you why this is useful? It's the Linux vs. Windows debate, open source vs. closed source, except in finance and payments.
Finally, just as every API added to the internet increases the value of the platform itself exponentially (network effect), every new tool and smart contract on the Ethereum network increases the value of the whole network to its users. It is an operating system for finance! This is the value proposition of the Ethereum experiment.