This question has been closed as a duplicated question, but the “parent” questions that is linked to as the possible duplicate is not there anymore.
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A possible solution would be to see duplicate questions as a linked list or a tree. We then can add rules:
Now each chain/tree of duplicates always have the same root.
If we now try to delete the root, two things can happen:
There should be functionality for moderators to change the root in a chain/tree, if another question has a higher quality.
If SE doesn't implement any changes to the system (like the one proposed by Gamecat above), then we may have to make a new policy.
I propose this: Whenever the last/binding delete vote is cast on a question, the mod/user casting it must search for dupes. Searching for dupes is easy enough, one can just use search with the
Then, these questions need to either be deleted or reopened (depends on the question). Of course, that's a logistical nightmare unless you have a diamond mod around. Or, if enough dupes exist, it may be better to just not delete (again, depends).