..Is that they've lost the strategic suspect of the cultural left, and the conditional tolerance of the orthodox Christians. And they lost it at the same time.
Being a Christian is a liability in liberal circles, to the point where your faith needs to be an absolute joke - a Christian who believes accepting Christ is irrelevant, who believes that God revealed Himself to man to support abortion and gay marriage, and more. Any orthodox content is openly laughed at, or whispered at best.
It used to be that liberal Christians could at least count on a grudging 'We all share faith in Christ' attitude among more conservative Christians, but even that's falling. The orthodox, rightly, see liberal Christians as dupes or traitors, and have gone from a neutral 'big tent' attitude towards a liberal presence in their church to actively wanting them to leave it entirely. "But by casting us out you'll lose our souls!" no longer has pull, because the realization is that the soul is lost if it isn't sincere and right in its remaining anyway.
So they're left with the most diminished voice of all. The strategic, formal respect of the left is gone, and the patient, neutrality of the right is gone.
Of course, they won't mind too much. Everyone regarding them as irrelevant dupes just gives them one more opportunity to get up on the cross and throw a pity party for themselves, which is the very thing that attracts them to Christianity to begin with.