It would be cool to have a new enemy type based around ghost-like constructs.
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But why would it be an enemy? Why not just make it a new race of people (not playable, but in existence in the universe)
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Automated Defense system, i was always a fan of the theory that The Traveler was more of a parasite using humanity to farm light but created Guardians as an act of self-preservation.
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At this point, I doubt they'd go down the "traveler is evil" route after that many rewrites.. It'd cause to many problems with the story already in place. Though I do like the automatic defenses idea..