User blog comment:Chaos11394/Where Do the Demons Go?/@comment-101.162.163.153-20140111061414/@comment-3481504-20141202204611

It makes the most sense, whereas everyone who says demons don't vanish from existence after death, are adding additional information to something's that not supported by canon. It's the default position to assume nothing happens to demons after death unless there's evidence for it. If demons go somewhere, or persist, after death, they need a basis for saying such.

If they survived, every demon would be an ever-recurring problem, Lilith would never die, Azazel would never die, Alastair would never die, etc. This insidiously over-complicates things, whereas assuming they cease to exist after death, unless resurrected, is sound.