Yes they will. I will however point out that the Catholic Church having been the leadership if you will in the apostate teachings many of which have been retained by most of the Protestant organizations stands out in prophesy. To whom much is given much is required if you will. It does say the whore “and her daughters”. The “daughters” being the Protestant organization that came out of the Catholic Church.
>>What grace the Roman Catholic church had will be gone... but the same for the Southern Baptists, etc.<<
No doubt about that. Those who think that attending or belonging is the key have a shock coming. “Going through the motions” is something all too many rely on.
The pollution is older than the Catholic-Orthodox split, really.
That’s why I see “coming out” as a matter of attitude. And a Catholic could do that without changing the building he or she worships in. As is said elsewhere, God is letting the tares sit with the wheat because that’s better for the wheat until it is ready.