Quantum resistant cryptography seems like the ideal choice for cryptocurrencies, interesting that only a handful have implemented this.
Vitalik, on the other hand, has always made quantum resistance a priority, and the account abstraction model and pluggable signature schemes are just now starting to take off. Basically, you can deploy a smart contract to hold your assets, and part of the smart contract is that to move assets from the contract, you need to sign a message with something other than the typical ecdsa signatures. There are some wallets today that you can even send funds with passkey signatures, which will use the keys sitting in hardware on modern phones.
> Vitaly Dmitrievich Buterin, better known as Vitalik Buterin is a Canadian computer programmer and co-founder of Ethereum.
> Gavin James Wood is an English computer scientist, a co-founder of Ethereum and creator of Polkadot and Kusama.
Most cryptocurrencies value compact signatures, and so run into many of the same issues facing PKI.
It is not an incompatible change to add new signature methods, a conservative implementation would have the public key commit to both an ecdsa key, and a quantum safe signature type, and use the committed ECDSA signature until such a time as it is no longer safe. This would result in no gain in signature size today, but allows for instant upgrades in place in the future with no additional transactions required.
Every new technological threat is a opportunity for scams.