Why do we have hybrid genres?
Would the primary fantasy genre be one that contains all the elements of classic fantasy (wizards, elves, dwarves, half-lings, humans, goblins, trolls, multiple gods, magic, quests and talismans just to name a few basics) with nothing else?
No romance, no politics, no social commentary, no science-fiction, no crime, no mysteries, no horror, no gothic and no suspense-thrills?
You dont seem to like these hybrids or combinations. To write pure fantasy would be an enjoyable exercise, but not very interesting reading, I think. We have all read (and for the most part enjoyed!) formula fantasy, but doesn't it get a bit predictable? Consider Terry Brooks' Shannara series. Do you think there is a reason their popularity is declining?
Publishers these days are looking for fantasy that takes an original approach, or has content that is new and different from what has gone before. They believe that these types of "hybrid genre" books will sell plenty of copies.
As for a new genre all together? Something that has yet to be used at all? I think a possiblity lies in man's exploration of the universe. If we were to discover new dimensions, with different laws of science and new life forms, social structures and technologies that are bound to these laws, and excluding Man's intrusion into these dimensions, maybe that would enable us to imagine something wholly different and separate from what we are using now? We shall have to wait and see.
"May the Angels Guide"