King of the Dead vs Witch King

What a fantastic finale it would have been, King of the Dead vs Witch-King, both as dead kings of old, a true symbol of evil looking to grow in power against another who is fighting to end his own evil-enduring punishment. I might add that this battle would have kept in line with the prophecy, as the King of the Dead was of course not a living man. And I think it would have easily matched the symbolic end to the WK in a meaningful fashion by comparison to his real end.