I occasionally post questions to Stack Exchange sites which get put on hold with reasoning of the form "this question is about X but this site is about Y". Rarely do I get a useful pointer to a site where the question would be on-topic.
Is there, or is there a demand for, a meta-level "question redirection" site where users can take a question (or even just a topic) not to be answered, but to be pointed in the direction of a knowledgeable audience that is interested in answering it?
I'm not talking about flat-out bad questions that wouldn't be on topic anywhere. I'm talking about questions like this one which simply don't fit in any of the existing Stack Exchange sites. A useful response to that one would have been something like "This isn't on-topic anywhere in Stack Exchange but check out this plumbing forum over here".