The framing you're seeing everywhere is wrong. Lagarde's warning about stablecoins isn't a central banker flinching at disruption. It's a specific technical argument about how monetary policy actually works, and it deserves to be read that way.
The mechanism she's describing: if deposit balances migrate into dollar-denominated stablecoins at scale, rate cuts stop propagating the way the models assume. Banks with shrinking deposit bases lend less. The ECB moves the rate; the rate doesn't move the economy. She put the number on it — stablecoins have grown from under $10 billion to more than $300 billion in six years, and 98% of that is dollar-denominated. That's not a crypto fact. That's a monetary sovereignty fact. For the ECB specifically, it means the transmission risk isn't hypothetical and neutral. It arrives pre-denominated in someone else's currency.
The EU has MiCA. The U.S. is moving on its own legislation. Lagarde's explicit point is that treating those as converging toward a single model is a category error — the blend of monetary and technological functions creates policy confusion that a unified rulebook doesn't resolve. The ECB has ongoing workstreams (Pontes, the Appia roadmap) aimed at building interoperable settlement infrastructure anchored in central bank money rather than outsourcing that function to private issuers. Whether those workstreams move fast enough to matter is a different question.
The question I keep coming back to isn't whether Lagarde is right about stablecoins. It's whether the transmission mechanism she's describing is already quietly degrading in ways the data hasn't caught yet.