I think it would be better if someone from Usa or any other country, with functional QCs comes forward and says we will, break the old or most vulnerable wallets, and not seize, or release the supply back to the market, but will give it back to the right full owner by taking some commission. But it will still dump the btc due to the reasons it was famous will be no more like,
Whatever they say doesn't matter. They can say one thing and do something else as long as they can get away with it. You often hear software owners say they won't take user's private data, but that is not always the case. They say your data is safe with them, but that is not always the case. So even if they come and say this, I don't think we can hold their word for it.
I only have a basic understanding of QCs, but if they're truly able to access wallets, without the secret phrases then like you said, bitcoin is not all that is at risk, so I agree with what the blog said that there should be a way, on the wallets end, to prevent this from happening