> (Unless Bitcoin forks into a quantum-resistant hashing method).

Aren't the hash functions bitcoin uses already quantum resitant?

> Well quantum computing's only economically valuable use-case is cracking RSA and other weak quantum-vulnerable cryptography.

The exciting use case is simulating quantum systems for physics & chemistry research. Cracking RSA is mostly a meme use case since the moment it looks like someone is about to get one everyone immediately switches algorithms.