I know how much ecumenism is important to you, despite some of the abuse you've taken, and I do admire you for it.
However, (you knew that was coming ;-0) I can't think of any instance of a top down hierarchy doing that. Do you believe the RCC would be capable of giving up its "Tradition" and "Magesterium"? How about admitting the falsity of "Apostolic Succession". If they can't let go of these heresies how can other Christian Churches be in unity with them?
That which is impossible with man is possible with God.