"any automated system that would determine whether a post should or should not be displayed to viewers and/or search engines, based solely on down-votes cast."

For completness, what you are proposing would seem to be a change in the existing consideration process, for example, current and new use cases:

In reply to Re^4: Feature: Auto hide. Change: show node vote counts to all, not just logged in users. by marto
in thread Feature: Auto hide. Change: show node vote counts to all, not just logged in users. by marto

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