Satoshi Nakamoto made the bitcoin code foolproof. If today's core goes haywire, a better fork will immediately emerge to take its place, continuing Satoshi Nakamoto's ideas. Because one of the requirements is that it be in open source. And it works.
If quantum secure updates are needed - then it makes sense to update all lost and Satoshi Nakamoto addresses to a 100% decentralized supply address - where everyone can buy those bitcoins again - and to the final quantum glove version!!