I know nothing about quantum computing, but when I read "does X instantly when rivals need 47 years", I immediately think about it being abused for brute forcing passwords and encryption keys. Would it be possible?
There are already quantum computer safe encryption algorithms that have been released to the public. I don’t know exactly how they work, but one of them was about reverse engineering a path through multi-dimensional space.
Expect SHA256 to disappear soon and be replaced.