alt Hacker NewsIt may be a plausible concern at some point in the future but, once it's possible, it would manifest as an extremely expensive and time consuming attack against a targeted address, it would require an enormous amount of compute. So, I suppose the first line of defense would be to never keep more funds locked under one key than it would cost an attacker to decrypt it.
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There are exchanges, custodians, etc that hold insane amounts of BTC or ETH in a single address.
We are talking billion dollars+ worth in a single address. So if either chainskey security is compromised in a way that it is conceivable to brute force it, there will definitely be plenty of targets.
Cost of running an attack is super cheap if one buys botted computers (it is/used to be $25/1000 machines).
Which leaves Bitcoin between a rock and a hard place. The Satoshi funds are probably worth an attack. At the same time they cannot move to post quantum cryptography, because that would also require to move funds.