But even if they didn't, a newly-independent American Catholic Church could bring a new vitality to liberal Christianity in the way that new movements, fresh with optimism and enthusiasm, generally do.
It would be starting with at least as many adherents as the liberal Protestant demoninations put combined, thousands of clerics, a network of educational institutions, a lot of real estate and a fair amount of cash.
Don't underestimate the spirit and commitment that marks many a new enterprise. It could see the new AmChurch through a lot of difficulties.
If he decides an American Church is the way to go, in union with him, that's the way I'll go.