My take of this is that they should remain in the IPv6 address architecture. There is current usage and removing them would break other specifications.
I would agree with that conclusion for mapped addresses, but I have heard NO ONE explicitly saying anything about the usefulness of compatible addresses.
Thus my take is that compatibles should be removed, and some kind of warning/reference text added to the mapped addresses. draft-ietf-v6ops-application-transition-03 (soon to be RFC) discusses some of this.
-- Pekka Savola "You each name yourselves king, yet the Netcore Oy kingdom bleeds." Systems. Networks. Security. -- George R.R. Martin: A Clash of Kings
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