The thing about the fantasy orcs is that not everyone depicts them as evil creatures. Some writers make an effort to make their orcish characters to appear heroes.
Yes, I have noticed that. And in their own worlds they can do what they want, and more power to them if they do a convincing job of fleshing out their own characters. But the nature of Tolkien's orcs is too well known and too well-established—and just as you describe it—to be redeemed by a single speech from Adar.
Who will not survive? Queen Regent Míriel, Valendil, Ontamo, Halbrand, Theo, Bronwyn, and Arondir.
It does seem like Miriel has outlived her usefulness to the plot, but I
think I have seen more scenes that include her in the trailers. Of course, trailers are not entirely to be trusted. I've seen some for movies that used clips that were cut from the films themselves.
Valandil and Ontamo seem definitely expendable, and I fear for Theo, Bronwyn, and Arondir, as well. But I believe too many unanswered questions and speculations about Halbrand have been raised to cut him out of the story as yet (if at all).