I don't think Priest will off her at the end of Defiance. Ever since I read the news of him being the new JL writer, I can't shake the feeling that his collaboration with DC isn't going to be a short-term affair. And given that he's not the kind of writer who likes introducing characters just to waste or kill them (looking at you, GJ
) we could see her pop up in the League title in the future.
And no, I wouldn't mind seeing her stay on the side of devils forever. It may be because I haven't yet gotten over Harley Quinn becoming a poor (and horny) man's Deadpool, or fothermuckin'
Killer Frost joining the JLA because Caitlin Snow from
The Flash is popular, but I don't want to see intriguing (or potentially intriguing) super-villainesses forced into heroic/anti-heroic role and ending up being tedious or just plain bland.