> most denominations will just disappear from evaporation and increasingly lax doctrine long before that.

Curious about this statement. Are you saying that doctrinal purity is required? I would have thought that Anglicanism especially tolerated an incredibly wide set of viewpoints. I still recall a one time Bishop of Durham saying that we had no right to insist on the veracity of the Virgin Birth. Is doctrinal laxity something measurable or simply a complaint the orthodox make when their fellow believers have moved away from them but are simply in the process of coalescing around a new set of principles?