Rather than discussing this on the IETF list, wouldn't it be rather
more productive for the discussants to get together and thrash out a
draft on how to use STARTTTLS in SMTP?
RFC3207 was published in 2002. 14 years and several revisions to TLS
later, it is probably time for a RFC3207-bis.
Since the issue at hand is the ramifications of a policy change for
IETF lists, the answer is no, it wouldn't.
It's unfortunate that such a policy choice requires a deep understanding
of how existing email software implements STARTTLS, but that's the situation
we're in.
Ned