If the fed did a cryptocurrency, it would be backed by the full might of the US Government — and all the things that the government can do if it decides to print more money. This also includes military and police powers.

Which brings me to the other point: currencies are governed at both ends; at issuance and at use. If you use a crypto that’s not approved, the government can simply arrest you for using one of its competitors. The treasury could likely do this without even needing to issue new laws, just new guidance. Governance is the reason for the existence of the US Treasury and Federal Reserve. It’s a core feature of any currency and the government isn’t going to abandon that lever of hard power. They’re only going to do a cryptocurrency that gives them more power, not less.

All of the stakeholders you list have a vested interest in not being disintermediated. They’re also deeply embedded in policy creation. I can’t help but notice the way crypto evangelists speak of crypto is the way leftists speak of Marx: in very vague terms outlining a utopian vision of a new economic paradigm that is frustrated by the sticky realities of the momentum of money and power. The reality of Marxism is different from the utopia, as would be the realities of central bank crypto (hint: it’s gonna be authoritarian af).