Not a substantial post by any means, but I'm thinking that a bit of foreshadowing has been done with dialogue from Mithrax and Lakshmi-2.
Mithrax, at the onset of this season with your quest involving the Splicer gauntlet, says that thr City and the Vex network are inextricably bound. He says that one must fall for the other to do the same (paraphrasing). He ends his speech by saying that every Vex we kill sends ripples through thr darkened sky. Regardless he has said that they are bound in a form of hyper parasitism. I'm aware that parasitism may not be the best example, but in this type of relationship the parasite will perish if the host is not strong enough to sustain them.
Lakshmi-2 has seen Mithrax standing in the heart of the fallen City amidst gunfire. She believes that Mithrax and his House Light will betray us, but I don't believe this to be so. I believe that she has seen a future in which what Mithrax has said comes to fruition. The city falls and the Eliksni are possibly fighting against FWC who is pushing to prevent the very event they are a part of.
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I like that parasitism. I think it was basically, the city is a construct for the vex, thinking this has happened at every place the traveler has touched...Mercury and Io are good examples, and both vexie. The one truth that got me, mithrax stating the vex are only fighting us because there isn't a reality or simulation in which we do not attack and keep attacking...typical AI sentience. Like in ready player two, [spoiler]the ai feels it is human, has simulated all these interactions, even the one where people are like "dude you're awesome", and it still feels like we would find a reason to destroy it[/spoiler]. There is no way to get it through a thick iron skull that we could benefit from them, instead it's always attack first, here it seems accepting of the mutually assured destruction mentality. Then there is what kabr did, what Osiris has done, what praedyth has done, what that scientist dude on Io has done...and how all of them messed around with a simulated reality that has infinite possible variants tied across perceived space and time.