I think you're right, in a way. CBDCs are going to be the only money allowed to exist. It won't be long until the US passes the Restrict Act, or something very like it, and encrypted communications are simply no longer allowed on the internet - for 'safety' reasons. The world will follow suit. VPNs will be banned, just as non-KYC exchanges are not allowed to exist today.
Tor, I2P, Freenet, Lokinet, and etc., won't exist anymore. The only secure communications will be local hardwired networks (these actually do exist already), or ad hoc radio networks people create themselves, such as Qortal or Beechat, but they will be discouraged, perhaps crushed with Swat style raids on folks using them. You'd be amazed how much shooting a few dogs discourages rebels. Central banks will issue CBDCs to replace fiat in bank accounts, and fiat will be no longer legal tender.
I don't consider CBDCs to be cryptocurrency, but that's all that's going to be allowed before long. I predict the global markets will be replaced by 2030. IIRC, the EU has already banned cash transactions over $600, and mandatory reporting of transactions around that size undertaken by the USA. I recall requiring the assistance of a 'sponsor' (who had substantial funds on deposit at that bank) at a large national bank a while back to cash ~$14k worth of checks drawn on that bank because I don't have a bank account. Of course this will eliminate banks, but it will basically replace them with AI on a global scale.
A form of global communication that is immune from regulation is necessary to enable unregulated global commerce, and I cannot see how such network can be created and maintained in the face of hostility from governments.
Sorry.