Apart from genesis block 50 coins and a few known others, u never know for sure, which coins actually belong to Satoshi.
This is an excellent point.
By bringing Satoshi into this, it becomes emotionally/politically charged. All we know is that all coins are inherently in danger because of the incentive to try and hack the protocol. That means taking any prudent steps to
keep everyone's coins safe, not just Satoshi's.
When we have to move to QC resistant algos, for instance, if there is a danger that huge numbers of early coins that never moved could be stolen by one person, something should be done. But that could take god knows how long, and all the early coins might become more mobile before then, even shortly before any algorithm change has been made.
I'm not saying "definitely do it, yesterday", that's not the risk. The risk is some future unknown scenario, so if we're dealing with pure hypotheticals anyway, why is anyone contemplating ruling anything out!?