Well I don't think anybody posts in the GT to change anyone's mind, or at least expects to. Theres too much ego at stake to say "I'm wrong and you're right".
But you're not entirely repeating your arguments either. That last point, the one you went out on ironically, is not repeated but something of a new comment. So I understand your meaning, but I still think laying your departure down with that much accompanying verbiage is gonna leave people a bit miffed. If I were to leave a discussion I'd either say it and not repeat anything said before or just not post at all.