So I got endings D, C, and E yesterday in that order.
I'm guessing this has been discussed earlier in the thread, but I haven't found too much discussion about it in the pages I checked.
Since yesterday, I've been wondering about which sequence is most likely to lead to Ending E:
Ending C -> Ending E
Ending D -> 9S boarding the ark -> Ending E
Ending D -> 9S staying on earth -> Ending E
I think Ending C works better as a standalone ending because to reach Ending E, 9S would need to die offscreen after being saved. I could see the idea of 9S dying soon anyway to make A2's sacrifice feel pointless, but I haven't seen any implications about 9S dying soon after aside from "All Black Box units are now offline." at the start of Ending E.
I think Ending D leading to Ending E makes a bit more sense because all three of the main characters are clearly gone. However, 9S boarding the ark makes his revival in Ending E a bit weird too. That's why I'm inclined to think refusing to board the ark in Ending D is the most direct lead-in to Ending E, as staying on earth shows an additional death scene for 9S that's absent if he boards the ark. As a result, I this scenario would make the most sense out of the three possibilities for Pod 042 to then say "I have come to the conclusion that I cannot accept this resolution."
I could have missed out on some key details, though, and I could still see ways Ending C and boarding the ark could lead to Ending E. But from my time with the story, I think Ending D and refusing to board the ark make the most sense as the path leading to Ending E.
My interpretation is that Endings C and D are basically the same things from different perspectives. You don't see the true nature of the Ark in Ending C but when A2 saves 9S, I feel it is assumed that his consciousness boards the Ark before it is fired. A2 only sees the part where everything crumbles because she isn't connected to the machines like 9S is. So in both Endings C and D, A2 dies and 9S survives long enough to transfer his data onto the Ark. Ending C actually makes more sense in terms of characterization anyway, and Ending D could still place within that from 9S' perspective, just without him being a moron.
Ending E will take place regardless, but I think it's meant to be a happy ending of hope as catharsis for the player, and it is not something a sequel will touch upon because...
Curious. I wonder if a NieR Automata sequel would then use Adam/Eve-like machine lifeforms????
I want this because it's real amusing how far Yoko Taro can "stretch out" the apocalypse.
I strongly believe that if there is another Nier game, it will take place thousands of years later on an alien world which was changed significantly by the arrival (or "invasion"?) of the Ark ship. It will explore how Adam, Eve, and 9S is perceived by such a civilization, and possibly have references to them as deities of legend, warped by the passage of time and the distortion of myth.