The Timeys being out of the picture and the "fairy tale" tone/style are two completely different issues. You could easily bring them back and have them be equated with the Elven Court, or whatever just as fairy-tale-ish. Or you could be as dark and gritty without having them in it.
The simple fact is they're gone because, really, they have to be out of the way for the sake of the Doctor's character and their own importance. They demean the Doctor's uniqueness and their own mythological status every time they actually appeared in the original series (and remember they first appear almost seven years into the show - which doesn't need them.)
The simple fact is they're gone because, really, they have to be out of the way for the sake of the Doctor's character and their own importance. They demean the Doctor's uniqueness and their own mythological status every time they actually appeared in the original series (and remember they first appear almost seven years into the show - which doesn't need them.)