For some it might. This article is talking about cracking military grade encryption. We still have time to come up with something before it happens, but maybe not as much time as we thought.
You could be right about not giving a warning. If someone moved 50 BTC from Satoshis address the market would likely tank but recover. The attacked might wait till they had a massive amount say 100k-1m BTC to show the network that SHA256 has been cracked.
Right, could be scary. Can you imagine the first million or so just migrating to coinbase?
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