I find it interesting that the burden is on the Catholic tradition to make all of the concessions, namely to "rehabilitate" Luther and his teachings, despite the fact that they countered the Catholic tradition and necessitated excommunication.  Yet, Lutheran and Anglican Protestants are not asked to repeal or amend their Augsburg Confession or Thirty-Nine Articles (or is it Forty-Two ;) to affirm their belief in Transubstantiation (not Consubstantiation) in order to present themselves for a Catholic altar call.  

Mister Kung is a Protestant, in fact, in the best sense of the term, and I say this with the utmost sincerity.  A Protestant Christian clings to 'protest' for identity, and Mr. Kung has been protesting the Catholic Church for many decades.  One cannot continue to protest the Catholic Church while accepting an invitation to 'break bread' with Papists.  Either the communion will be a travesty, or the righteous claim to protest will be.