It'll be like that 'from now until doomsday'. [=for a very long time; forever]
The book explores a 'doomsday scenario' in which an asteroid hits the Earth.
a 'doomsday machine' [=a machine that will destroy the world]
(..) I've heard of family fights, but my God... You've got a bigger fight than that coming, rookie. Guardians are talking about this like it's doomsday. Has Oa been cleared out? Not a Lantern left on it. It's just a husk now. What about here? Quiet so far. I'm thinking of taking a closer look. (..)2011 Green Lantern: Emerald Knights