Not the worst fate possible in this awful world tbh.
I'm kinda loosing the plot ngl especially with the series being monthly. I marathon ran jinki, extend, relation and both winvurgas and the timelines are just confusing (including the VN games, ignore the anime(s) genuinely). It also results in Schrodinger's virginity for aoba(black hair) as she looses her "first time" repeatedly throughout all the series: in jinki(shinsetsu), then again in both vn separate times(author also wants to bring a vn character in winvurga which makes no sense?? The one with white hair), then in eden's gritter renge, then in the official jinki doujin(x series) and now people are predicting her to loose her first time again possibly in this series. Maybe extend/relation and winvurga are separate timelines(even though we've seen aoba in winvurga), maybe games not canon and doujins are separate timelines(yet confirmed canon), it just gets kinda ridiculous. These plotholes are kinda expected for a near 20 year old continuous smut manga though I guess and the author is pretty casual with admitting they forget stuff lol.
Idk. I think it'll end with either the world ending, dominators wiped out, or timeline shenanigans returning to Aoba in original jinki timeline and somehow prevents everything that's happened from happening(win may have power to alter past some theorize). I think Win will end up reversing what happened to mashiro whether by timeline stuff or with her healing wand or with some scapegoat(memento memory, fake memories etc) just so she can have her first time and fulfill the whole romance point of the previous series, don't hold out any hope though the author writes blogs on Mashiro having different Dominator babies and mashiro is for sure his favorite character(win is like 3 or 4th i think) so expect mashiro to suffer for awhile before she's likely saved and reverted.
I doubt the ending is anytime soon (especially with it being author moneymaker) and I could for sure see a new jinki series or two before this entire series ends in a decade or so(author for sure wants a win getting taken scene).
With the power scaling rising usually smut mecha manga always end with some universal threat or timeline stuff every time so one of those is my prediction.