That’s somewhat how Frostcloud and Philosophyforum do it. Questions at the top of the list are the ones with the latest answers. So there could be a new question sitting right next to an old question. It definitely prevents the same questions from being asked over and over again.
Their home pages list between 15–20 categories. Hundreds of questions within each category. But only the one with the latest answer for each category is abbreviated with user name on the home page.
I actually like it. It prevents having to surf through a plethora of “Is he going to leave me” questions.