Over time they likely will and it's not been that long in Zepher's case, but there's also the debate of should feedback from trusted users be excluded because they're no longer active or have died? Imagine if you have a lot of feedback from users who have left the forum for whatever reasons. You could go from being pretty trusted to having little no feedback. You could make the argument that any active member would continue to get feedback from others but not always, especially if you don't do that many trades as you used to and that's why admin intervention may be better in certain cases to remove a specific feedback that's causing an issue, but maybe theymos still doesn't want to get involved in that.
I think it is why for rare cases like Zepher, whom passed away, and have solid evidence of death, negative feedback on cases already solved should be manually handled (with replacement of neutral or remove of original negative feedback). Only admin can 'hack' into Zepher account and manually replace his feedback.
If Hal Finney thread edited by admin, it means we always have special cases for manual handlings.
Debate might occur on cases that have not been confirmed as real deaths, not 'fake' ones, like forum treasure hold by
paraipan , whom still have not yet confirmed actually passed away or not.