That's an interesting expectation. As co-author of the planned deprecation draft, I'd been assuming a more classical deprecation action, in which we would simply state the previous semantics of FEC0::/10, state that the prefix SHOULD NOT be used, but leave it permanently assigned by IANA.
The term "permanent" is a bit long. It should not be used for some period of time, and since there's a lot of address space out there, perhaps that period of time should be considerable ;-)
Eliot
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