Poor Rowan Williams. He's handed the captaincy at a time when the ship had already began sinking, and then people complain that he is a bad captain. Not that he helped the cause any, but still, I'm not sure what he could have done...
Also, I don't think Lutheranism, Anglicanism, etc. will die out in a few centuries. It is true that many early Christian groups died out in the first millenium, but that was in a very different situation, compared to what we have going on these days.