The Traveler seems to have a force field, as you can see in concept art, the clouds are always in a circle around and away from it and the city. It isn't FULLY functional, I imagine it still has a "spark", otherwise it would be kinda pointless. The time travel theory makes absolute sense, I like it. Otherwise yea I have no idea and it makes me all the more excited.
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Well, if the Guardians are drawing power from it, it has to have SOMETHING left, yea.
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That makes sense. If it had a Force Field it would need some source to power it. All it could need is a spark. Maybe the Shield is slowly deteriorating, and we don't know how to stop it. It could be why we're in search for answers from our past.