Since we require a large amount of information in questions for them to be acceptable here, it makes sense that many questions would be unanswered. Often, software that does exactly what people need simply doesn't exist.
If a question is low-quality for one reason or another, we should close it. Otherwise, I'd say we should just leave it alone. There's nothing bad about having unanswered questions, and software might exist in the future that answers the question. If someone makes that software, we can go back and add an answer to the question.