Interesting Idea, but it could also easily degrade into flaming matches that  are on many other forums. That is, a  friendly  back and forth can  just as well become an abusive argument done just for the sake of arguing. Who wants to have to police that kind of thing?

As it stands now everyone has one chance to say their peace and pick it up with private messages should they so choose. It has limitations but advantages as well.

The strong do as they can while the weak do as they must.