"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:
- Reap: SPAM.
- Reap: troll.
- Reap: abuse.
- Edit: add code tags please.
- Edit: reparent to [id://xxxxxx].
- Hide content: A collection of poorly formatted buzzwords/Does not address OPs question/Is not an answer.