The issue with that is, the answers that follow depend on the question. If the question cannot be answered as a clear cut fact then an discussion is inevitable. Also some questions by their very nature attract discussions and they turn out to be the most interesting ones.

As somebody else also mentioned, some topics just can't have a clear factual answer like religion, literature etc.

The problem with factual answers is, there is only that much you can do with general problems that everyone face. Once those questions(problems which every one face generally) are answered, your site turns to a knowledge repository. And then the site traffic greatly depends on specific problems faced by people and most generally nobody else gets interested in those.