If „they’re“ using a „quantum“ computer the #Bitcoin network will use a neural network of „quantum“ computers. Exponentially more powerful than theirs. Hashrate, difficulty levels and crypto algorithms will all evolve with the increase in computing power. Increase in computing power goes both ways.
Discussion
I understand what you're saying. And I agree. Bitcoin will likely be prepared for this. SHA256 is already quantum resistant, what needs to be changed is ECDSA encryption used in wallet creation