I recently placed a bounty on a long-standing zero-answer question (that question is in this link): Does there exist a space filling curve which sends every convex set to a convex set ?
My goal was to promote the question. Did I accidentally do the opposite? If nobody answers within the time limit, does the question descend into a land of oblivion, where it will never be noticed again? I would prefer the question to remain (I did not mean to kill it). (PS: I don't care what happens to the bounty points.) A related followup question is in bold below.
I noticed this 0-answer question 1-2 weeks ago (I noticed it particularly because I searched for unanswered questions). I read it, walked away, and later came up with what I thought was an interesting answer. So I found the question again and typed up my answer. A user pointed out that I neglected a key assumption in the question (which I had indeed forgotten about).
I was going to delete my answer but I was encouraged to keep it, as it was a "partial answer." Of course, keeping a partial answer means the question will no longer appear when people search for unanswered questions. To compensate, I posted a bounty on the question. However, I now wonder if it would have been better to just delete my answer, since perhaps a zero-answer question has more visibility on this site than an expired-bounty question.
My own "partial answer" for this particular case likely does nothing to help answer the actual question. But in general, there may be hard questions for which partial answers can be helpful and/or can inspire others to give more complete answers.
So, ideally, it would be great if there was a way to maintain high-visibility for expired bounty questions and/or "interesting and hard questions" while also allowing for partial answers. Is there an existing mechanism for this, and/or is it possible to develop one?