I guess the real question now is which way will ABC Rowan go? Is he a revisionist (personally he is) or an institutionalist (his actions as ABC have been)? If he holds firm with the tradition, he will still have a Communion but he may lose his own CofE.
I actually think he and his boss are trying to have it both ways. A schism has already appeared between the revisionists and the evangelicals and he is trying to stay friends with both sides.
There will no longer be joint Primatial gatherings, joint Lambeth Conferences and a joint Consultative Council. Instead, these meetings will occur within the two respective sides. Archbishop Williams and his successors will be invited to such events by both sides and likely regularly attend.
In other words, the evangelical Anglican Communion (based in Nigeria) and the revisionist Episcopal Communion (based in New York) will both be “in communion” with Canterbury but will have little to do with each other.