The only thing that could possible stem this tide if the Anglican Churches in the 3rd world who are largely evangelical speak to this nonsense.
This is the problem with a lot of mainline churches. They have tons of real estate and an income (from the estates of long-dead people who never dreamed what these churches would do with it) and they don't care, frankly, if the pews are empty. Just so long as there's enough to support a left-wing gay clerical "couple."
The Third World Episcopals should use the ideology of the wreckers against them - they should call for the wealthy congregations of the First World to sell all they have and give to the poor and underprivileged Christians of the Third World.
They should continually remind the wreckers of their obligation to the poor and publicly lambaste them for their hypocrisy and luxury in the face of the starving millions.
The wreckers would have no effective answer to such a campaign.