A recent case of a question being marked as a duplicate of another still unanswered question pushed me to think about unanswered questions and questions that asks already asked things.
I understand that we need to concentrate answers in a single place, so we have a way to mark duplicates. Also asking again the same question few time after the original question seems not a good idea. But what if we find that a new question is a duplicate of an old unanswered question? I think we should mark as duplicate the old question, instead of the new one, as the purpose of concentrate answers will still be achieved, while we would get more chances to get answers.
Either if you agree or not marking as duplicate the old question, the banner notifying about the duplicate should be reworded to avoid confussion. As it is now, the banner we can see is (emphasis mine):
marked as duplicate by [Nice_Citizen] 1 hour ago
This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.
while it is clear that the original question still has no answer, and the text suggest a new question could be asked in case the question was not fully addressed.
PROPOSAL
1- If the original question is older than 30 days we should mark as duplicate the older question, instead of the new one.
2- The banner could be modified as:
marked as duplicate by [Nice_Citizen] 1 hour ago
This question has been unanswered for more than 30 days, and has become a duplicate of: [Link-to-the-new-question]