This already exists, downvoted and closed questions will usually be removed automatically.
The exact criteria are listed in this post on Meta Stack Exchange:
Just to formally document the exact policies we have in place to
remove old abandoned / dead questions, the Community user will
delete questions in the following circumstances:
If the ...
They got selected for deletion because of lack of community interest:
If the question is more than 365 days old, and ...
has a score of 0, or a score of 1 in case of deleted owner
has no answers
is not locked
has view count <= the age of the question in days times 1.5
has 1 or 0 comments
... it will be automatically deleted.
There are a couple ways this is already done.
When a question's score drops to -4 (or below) it is removed from the front page, and is therefore "hidden" from many/most viewers. In this case the question still exists undeleted, and will be shown if you view questions from another list (e.g., tag-specific lists, other search results, and even the "questions" ...
The title of the question mentions manual deletions, and Gil Kalai's answer voices his opposition to that. Let me answer quid's other concern: the system is currently automatically deleting some perfectly fine questions. I encourage 10k+ users to monitor the list of recently deleted questions, and vote to undelete reasonable questions that have slipped ...
I support not re-starting manual deletions. The situation today with automatic deletion and no manual deletion is better than it used to be in the manual deletions era and it is also better to avoid practicing manual deletion on top of the automatic one.
(On pupular request: update)
As quid explained: "What does not get auto-deleted are closed questions ...
This is answered at the StackExchange bounty FAQ. If a user account is deleted with an outstanding bounty, then the Community user becomes the bounty owner, and the points are eventually awarded following the "no intervention" rules.
This usually means one of two things:
There has been an automatic bump. This happens to questions which have positive (or maybe non-negative) score, when they have an answer or answers yet none of the answers has positive score or is accepted (that is, they are still in the "unanswered" list while having an answer). My experience tells me that if there are ...
Depending on how one reads your post, it can be considered as two or three (or perhaps even more) closely related questions.
Could (and should) we change behavior of the community user such that it bumps questions which have no answers? What are the reasons why this feature request currently works the way it does?
It seems that the main purpose of this ...