The solution to that concern is lead time :). Provide a way to embed a QC-safe pubkey in outputs today, give wallets plenty of time to adopt it, then there will have been years and years of lead time ...
Arbitrarily deciding when to freeze peoples’ coins against a threat that has an unknown arrival time is irresponsible. I don’t disagree with adding quantum key schemes. I disagree with freezing peoples’ coins.
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