Not saying this will happen, but it would be fascinating if the original gods eventually all died off and new ones replaced them (i.e. current and future demigods).
The kinds of legends and tales that could develop around them. A bit similar to poog's current idea with Lifprasil and Alefpria, but on a universal level :O
Or perhaps they would pass into mythology, false creations of earlier peoples who did not know the truth...