User blog comment:Simplyme/Fading?/@comment-71.205.210.226-20110909224855

Helios faded because of the depression he had when his only son died. I don't know the full story, but I remember reading it somewhere that, that was the reason why he faded not because Apollo took his job. Selene for all we know is not faded. Riordan never mention her fading besides saying that the Romans gave her job away to Artemis (not sure if I got that from one of the books or somewhere else). She could still be chilling with the titans or something. Eos still supposedly drove a chariot across the sky after he siblings "retired". She sort of marked the way for Helios and then easily transitioned to Apollo. She and him had a crap ton of kids through out the years supposedly.

I know how you feel about these gods just being thrown away. I personally really like the trio of all of them and wished the Helios had faded. Maybe because the doors of death are open we will see some gods return. Anything is a possibility right now with how Riordan set the story up. He can take some real big chances and change the story with a lot of huge twists that none of us will expect.