> We should just settle on a single internet currency that's fast, interoperable and not a market for speculation.

With respect to crypto, a "single currency" shouldn't be a prerequisite because, with a $3T mcap, crypto has plenty of liquidity across centralized and decentralized exchanges to allow anyone to convert between any currencies they have on-chain. (Uniswap for instance has $1B - $6B volume transacted daily.)

Declaring a single currency would also be antithetical to free market competition for currencies.

> interoperable

If "interoperable" means you can use the currency anywhere, then I think liquidity for currency conversion is sufficient.

That said, we already have dollar (USD) stablecoins[^0] on all major L1, L2, rollup blockchains. Because they are pegged to the U.S. dollar, they also meet your requirement that the currency not be speculative (Strictly speaking, the U.S. dollar is inflationary and therefore is subject to speculation, but perhaps I'm being pedantic.).

> fast

Rollups[^3] provide fast transactions. These use various cryptographic protocols to verifiably and quickly batch and compress user operations on-chain.

> deep integration of modern banking changes

"Deep integration of modern banking" sounds good but modern banking creates a choke point[^1] where users can be targeted and denied services. Ultimately we would want to be able to stay on-chain for all payments and not need off-ramps which leave users open to debanking[^2] or surveillance. Crypto is permissionless and, with little effort from the user, censorship resistant.

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[^0]: https://castleisland.vc/writing/stablecoins-the-emerging-mar... "Stablecoins – tokenized representations of fiat currencies circulating on blockchains 1 – are unambiguously the “killer app” of crypto so far. There are over $160 billion worth of stablecoins in circulation today, up from single digit billions as recently as 2020. Over 20 million addresses make a stablecoin transaction on public blockchains every month. And in the first half of 2024, stablecoins settled (according to our adjusted estimates) over $2.6 trillion dollars worth of value. Stablecoins offer considerable advantages relative to existing payment systems, including native programmability, strong auditability properties, fast settlement, the ability to self-custody, and native interoperability"

[^1]: https://www.piratewires.com/p/2023-banking-crisis "Beginning in 2013, Choke Point was a scheme which sought to marginalize specific industries operating legally — not through lawmaking, but by applying pressure via the banking sector."

[^2]: https://x.com/nic__carter/status/1862950205252874552 "[T]he FDIC and other financial regulators had secretly imposed a 15 percent cap on deposits at banks for crypto-related firms."

[^3]: https://l2beat.com/scaling/summary