The bigger game is not the success/failure of TNG or how it should "end", but how does humanity prevent so many ( maybe all of us ) from damnation. That's a 2 fold problem: those already damned ( is there a way to save them still - if there's not, while I understand the panic of those still living, a callous approach to throw millions under the eternal bus just to spare yourself ) and those in line to be damned. The Inchoroi determined TNG to be a solution to this problem, but there is still too much mystery about TNG ( like even it if reduces the population to 144k, would that break the soul cycle and shut the gods out - it might not, hasn't on other worlds apparently ). Also, are there alternatives less violent to accomplishing the same thing? Appears Kellhus thought so. Let me tell ya, if dying at the hands of the TNG meant avoiding eternal damnation, count me in!
In short, the next books will explore all of this on 3 or so levels: Individual TNG effect experiences ( hoping for some from the Mutiliated, but we'll get Akka/Mimarra/the boy/Moe Jr at the very least ), TNG war strategic experiences ( which cities fall, how fast, population counts, Zeum and other country resistance efforts, divine expressions perhaps ) and if any of this improves outlooks for humans in the afterlife. Damnation dwarfs all other concerns, so much so it led mad horrifying plans by The Consult to address it. Kellhus apparently was pursuing other avenues - while the GO was a hell of a journey ( pun intended ), it seemed to be a kinder approach than what The Consult are pursuing - but if Kellhus's approach fails, then The Consult are probably on the right track.
To bring this back around to the original topic, if I simply gain some insight as to what the hell happened in the GR, I would be satisfied.