I think there should be some way to make any "incorrectly answered question" have "unanswered" status. Just because someone has responded to a question doesn't mean that it is worthwhile. In fact, many such "quick" answers are not well thought out.
(Or have I misunderstood? Do questions remain "unanswered" until an answer is accepted. If so, it would be good to have a flag that the answer was, shall we say, "insufficient".)