I feel like at some point the Traveler unleashes some sort of awesome power and possess the Cabal and the Fallen and you fight alongside them in some epic battle against a darker more powerful enemy. (I think it'll be the moon base hell mouth guys or have something to do with the pyramid space ships) But these are all my predictions, either way I know whatever happens it will be awesomely epic they are cinematic story tellers after all, what do you guys think?
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Pretty sure the Hunter is hiding for a reason :) I think that's the speculated Glimmer at work, not the Traveler. Imagine, Ethreal Aliens that cannot interact with the real world and possess puppets to get their shit done.