Earlier quoted context omitted.
No philosopher worth her salt would try to answer this question as formed because of the large number of buried assumptions in it that presuppose the form of the correct answer, and that answers not meeting that form are, by definition, incorrect. Your question is a sophisticated version of "have you stopped beating your wife?"
Let's look at this question: What "truth" has mathematics itself produced from that search which is well-defined, non-trivial, and correct? Is it a loaded question? I think it isn't, and it has a lot of valid answers. Here are some recent ones: http://en.wikipedia.org/wiki/List_of_unsolved_problems_in_ma... . Why the corresponding question for philosophers should be loaded? Are they exempt from settling things?
Second, there is no requirement for philosophers to "settle things", and it's undemonstrated that, in order to settle things, the answer must be well-defined, non-trivial, and correct. One example of that is Wittgenstein's dismissal of a significant number of previous philosophical problems as empty language games. The field advances; it doesn't "settle things" in the sense that mathematics lays down proofs upon which the edifice later builds. Sometimes the advance is dismissing large portions of what went before as mistaken.