Where do imaginary friends go... when they're forgotten?

[Lynnie]

Huh, I kind of have a theory of what happens to IFs when they're "forgotten". They are, after all, ideas, thought up by their creator. Ideas can fade, especially once the person who came up with it is no longer around to remind others of it. So after the creator departs from this world, the IF can start to "fade", and maybe get sickly and age or something. When they are in fact forgotten by everyone, then they depart from this world as well. In the case of Uncle Pockets, he was obviously a hit when his creator was young, and even after his creator is gone, he's still remembered and known by many, so he's still going strong. In the case of the scribbles, they are still remembered in the very back of the subconsciences of the babies that thought them up. And as for being taken before their time, it's the manipulation of the creators (or the human thinking of them at the moment) imagination that does them in.

But then this doesn't exactly fit into the Foster's universe where IFs do indeed become "real", but eh, it's the best I can come up with.