Then the person can PM the person that asked a question in that case.

Which removes the whole point of a forum. What good is it for someone to search for that topic on the forum, just to find it closed. People also subscribe to threads, so even if they don't get a reply right away, someone could come along and give them the answer they need. Then someone else comes along with the same question, searches for it, finds it, and their problem is resolved.

Mike