This proposal translates like a bank statement.
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Hey you have an inactive account at bank bitcoin. If you don't move your funds in xxx days, your account will be deleted and recovery won't be possible.
Cheers,
Jameson Lopp
It sounds bad but the alternative isn't so good either. Imagine coming back after 20 years of inactivity only to find your old P2PK outputs stolen by a computational threat that could have been avoided. The biggest fault is still with the users for not doing something about it already. But we also have to assume that there are many old-timers who are gone, just like satoshi (assumedly), so there is nothing that they can do.
It takes a hell of a lot of time to get consensus in bitcoin. We need to upgrade in the next years, but keep migration optional, if quantum computers do not prove to be threatening.
And run the network with two algorithms simultaneously? One being the classical quantum-vulnerable one and the second the optional post-quantum one.