I'm the one taking crazy pills now at the sheer repetition.
Let me try to establish a baseline here.
What we know has happened:
1) Sakura thinks that Shinobu was cheating on her and was dropping her soon.
2) She's stupid weak minded.
3) Fuccboi takes advantage and fucks her.
4) Sakura breaks up via text and moves to the other agency.
4) Fuccboi tells Shinobu about fucking Sakura and asks him to stay away from her.
5) Shinobu agrees and never contacts her again.
6) Sakura never tried to contact Shinobu.
7) Shinobu doesn't speak to Fumi in those months.
8) Shinobu has a break becuase his film was successful and meets with the Producer.
9) He meets Fumi again and we see that Shinobu copes saying the break-up was better for Sakura.
10) Shinobu still has feelings for Sakura
11) Fumi says in no uncertain terms that she loves Shinobu and wants him to really know her.
What we don't know:
1) Is Sakura dating the fuccboi?
2) Was the sex a a one time thing or have they been regularly hooking up?
3) What are Sakura's feelings for Shinobu?
4) What is her current mindset?
No matter how much peeps dissect the panels, the translations, the japanese text, Katsura Airi's talent and profile, the star signs, the tea leaves, the animal jaw dropped on the floor: we do not know anything about those 4 points thus we have no way of knowing where the story will go.
Meta wise, we know the following:
1) Japanese fandom rioted after 129 and 130. That's the only relevant fandom because they are the paying customers.
2) Katsura Airi made some half-assed double down posts but nothing more.
3) Katsura Airi has softened the NTR endings on the last epilogues for the Karami Zakari Hentai.
4) The ending of Karami Zakari Manga shows Iida and Kousei being happy in their "relationship."
So where to go from here:
There are two ways of making predictions. In Universe and Meta. By In Universe I mean speaking within the boundaries of the story, speculating on what character will do based on what we know from there. Meta is speculating about where the story will go based on the author's previous works, twitter threads and and reader backlash.
In Universe:
There is really no point in trying to figure out what has/will happen based on character characterization so far. We see in chapter 131 that Katsura Airi is keeping her options open. There is absolutely no way of knowing if the three sex panels from 131 are current events or just imagination. No visual clues were given, nothing. It can go multiple ways based on what we know and we don't know much.
Meta:
We know that Katsura Airi killed her own premise. There was no rom and certainly no com in the events of 128-131. Just a crude set up, a sex scene and a timeskip. All the options are open at this point but we are 1 bad chapter away of everybody (the paying customers) dropping the work en-masse. NTR might be the highest selling tag in hentai but it's certainly not in mainstream manga.
My prediction:
I think that we're moving to a "good ending" regardless of what shape it takes. Shinobu will probably be fine. Regardless of Fumi or Sakura being the end game, as long as Shinobu doesn't look like a total wimp, normie fans (the majority of the paying customers) will accept the ending and will not vilify (too much) the author.
My preferred ending:
Sakura and Fuccboi was a one time thing and she gave him the "I just want to focus on my career" spiel. This to slightly rehabilitate her image with the readers.
Shinobu will somewhat accept Fumi's confession followed by a few chapters of will they or won't they.
We start seeing more of Sakura in ambiguous situations. Is she fucking other people or not?
Shinobu is doing fine but his work is by the numbers. No failure but not huge success.
Suddenly Sakura enters the picture again. They will be working on something. Sakura treats him in a curteous but work like manner. Fumi encourages Shinobu to give his best. Queue awkward interactions.
Sakura is given clues that she might still like Shinobu thus re-introducing 'Rom'. Some embarrassing shenanigans, bringing the 'Com' back.
Then one day Fumi tells Shinobu they can't find Sakura. She is being threatened by a co-star or a creepy crew member.
She really doesn't want to, that would be... Queue flashback with Fumi telling her that nothing ever happened with Shinobu before the break and she is the one he really loves. That if she still feels anything for him, she should accept doing this movie with him.
Meanwhile Shinobu is looking for her desperately and saves her in the nick of time. This brings the original premise of the manga back.
They look at each other, smiles and tears, the end.
The epilogue is about how the movie was a success. Fumi is also a big deal, fuccboi is making movies in USA or some shit like that and it's implied that Sakura and Shinobu are dating.
Conclusion
The only team I am at this point is Team Decent Writing Please. I am not a writer so what the fuck do I know but I think the chain of events I described would somewhat restore the premise while softening the pain points of the latest chapters. No big punishments, no big humiliations, no grandiose set up. Just flawed people doing the best they can.