The big problem isn't the Church of England (or e.g. the Church in Wales) but the wider 'Anglican Communion' which increasingly feels pointless and untenable. Welby is very attached to the concept as he spent a lot of time in Nigeria before he became a clergyman and, to be blunt about it, I think the resulting sentiment often clouds his judgment.
I wouldn't say that the Communion is pointless (I think there's a lot of value in having some link with other Churches who have the same religious foundations) but it is getting pretty untenable. On top of the sexuality divide, you have the tension between the rapidly-growing churches in Africa and elsewhere versus the aging Anglo-American churches. It's an unfortunate situation, and it's unclear how one can keep the Communion going with these chasms.
