bitcoin proof of work is not as impacted by quantum computers - grover's algorithm provides a quadratic speedup for unstructured search - so SHA256 ends up with 128 bits of security for pre-image resistance. BTC can easily move to SHA512.

symmetric ciphers would have similar properties (AES, CHACHA20). Asymmetric encryption atm would use ECDH (which breaks) to generate a key for use with symmetric ciphers - Kyber provides a PQC KEM for this.

So, the situation isn't as bad. We're well positioned in cryptography to handle a PQC world.