So now what- even post quantum cryptography isn't good enough?

Wasn't too long ago Vitalik hardly considered quantum computing a threat. Now he's questioning if even post quantum cryptography could be at risk. Though he notes we will need some form of post quantum cryptography: "However, signatures and encryption serve different purposes. Buterin argued that public-key encryption presents a harder challenge because it needs mathematical structure beyond hashes alone." My take is you need a solution to get off ecdsa / rsa yesterday because these

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