The reporting system and SCBL aren't very dependent on the SC email system. If I understand correctly, most of the data feeding the reporting side of things (the part owned by Cisco) doesn't come from people who use "spamcop.net" (or "cesmail.net") email addresses, but rather from people (and/or automated processes) submitting spam to the reporting side, and especially the submissions from "spamtrap" addresses, so taking our "Held mail reporting" out of the picture won't result in any significant change in the data flow that feeds the reporting/reputation/blacklist side. You first paragraph is all correct, but your question isn't particularly relevant, in that there won't be any significant change to the spam-reporting platform and blacklist elements of SpamCop.
DT