Of course there are many reasons why nodes go unanswered. I actually thing Sunday night is optimal for really hard questions as there will be very few questions in SOPW on Monday am when people get to work (not). I would at least like to see X/Y replies where X is replies in the Front Page sense (ie direct) and Y is total replies to the node. I find the threaded NN just too long. Ideally you want to do threading with Javascript so you can collapse and expand the branches without a round trip. I don't expect that idea to float any time soon though.