I think the most exciting thing the Traveler has done was scold Rhulk through a ghost. There has to be more to the Traveler then being just a set piece at the Tower.
It's archenemy is closing in...does the Traveler have a battle plan? It obviously can speak through ghosts...so why doesn't it more often? At the very least why hasn't the Speaker's Mask been repaired and utilized by someone. I'm sure Ikora could pull it off.
I hear Zavala going on about the Traveler constantly but it doesn't seem to be a participant in the story.
Come on Bungie, can the Traveler do something that proves that it's in this fight with us? Something unmistakable.
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The Traveler not speaking directly to us is the point, which highlights the philosophy of the Light and Dark. The Witness is constantly whispering in our ear, tempting us with power and that it is our Salvation. The Traveler empowers us and gives us the freedom to act on our own free will, giving all those blessed with the Light a second chance. One is a manipulator that would discard us the moment another race proved themselves our betters. One is a silent watcher seeking to prove the point that slaughter is not the only way that beings claim a right to exist.