I wonder what Bungie is going to do with Savathuun and her Lucent Hive. They must still have a part to play. They'd be great allies, if they could stop acting like typical Hive for five minutes and have Savathuun start acting more like a strategist and stop being a deceiver who can't be trusted.
The Cabal and Eliksni have joined us, now all we're missing is a Hive and Vex faction.
Edit: Because Savathuun doesn't have a worm to feed anymore, she doesn't have to follow her nature. She CAN pick a new destiny for herself. Bungie just has to get on top of writing her redemption story.
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There's the Prophecy (Not as in the dungeon) from Arrivals (Might be Arrivals? Can't remember what season it happened on) regarding the room which showed us a Dorito Ship surrounded by each faction. And by the way they've done the story is that Fallen and Cabal joined us alongside the fact that they were represented in the room also, and Savathum acted both ally and foe in Witch Queen by hinting towards the Veil and hinting towards Lightfall.