The cost of a DWAVE quantum computer is 10 million right? If they could figure out how to get the data out it would rock. Then they have to program it.
200 molecular qbits would be enough to calculate all the particles in the visible universe. That was on YouTube, so source bias.
A hash may be a killer to find another solution to classically, but a bunch of qbits seem like it would break the crypto.
No blockchain.
But you would need to bring the price down a bit to make it scary, when it exists.
Still never say never.