Quantum supremacy was a lie or a failure attempt. may be they failed to break cryptography but they showed potential risks and whole crypto industry
Bitcoin is able to change if needed.
Best developers, highly motivated miners/devs/users. This trio team can do whatever is needed to resist quantum power.
I don't guess that, i know that.
Quantum theory is more sort of a Hoax and there is no threat the bitcoin blockchain because of this. Yes, it is a fact that computing powers will be increased over the years but they will have no effect on bitcoin. The question on bitcoin be able to change, if required is out of question as no one want the current status to be changed and it should not be changed.