I've asked a couple of questions, here and here that haven't been answered after quite a while. I see no way to improve them. I have asked that they be closed. But, on reflection, would it be better to have them deleted? How does closing a question rather than deleting it affect AskUbuntu's stats?
I would just leave those two open, they seem to be fine questions, just not getting attention.
Though you haven't really added anything to them since you asked them; you should at least try to add some results of your research into them if possible; surely there's something out there that you've found that might be related that you can add to the questions.