We have had this discussion a lot of times already, before super computers become a threat to BTC, we would have moved to an algorithm that is resistant to it. The development of quantum computers is a gradual process that will take a lot of years, it is not like we would wake up one morning and QC is set to break BTC, this gives the network ample time to develop a resistant algorithm.
However, take note that if QC is ever a threat to BTC's SHA-256 algorithm, then the threat does not rest on only BTC, but on a lot of industries, and BTC may even be of lower interest for attackers.
Im also advocate that if QC can decrypt the SHA 256, it can also fortify not even AI tech can break it at that point. Things are moving so fast in this era that this technology has to improve a lot to avoid becoming obsolete at any time. Even gas fees are going to obsolete at that time so many crypto's that are depending on it might have to think otherwise.