Season 4+Season 5 Prediction. I'm probably wrong, but...
From the last episode, we discovered Jade/Tabitha always become victims of the town. I have a few predictions of how this is gonna go.
Jade will have a very confident plan to save the situation. Things will look and sound good. Things will take a sudden turn and he will realize he just made everything worse for everyone, and maybe even helped the "evil" side by making a move that benefits them unknowingly. The story will be that trying to avoid the "massacre" is actually the very thing that upsets the town and sets off the beginnings of the "massacre", at least it will seem that way, in a self-fulfilling prophecy narrative sort of way. This will be the majority of the rest of season 4, leading to season 5 for our good guys to ultimately fix the situation (which I do think will ultimately happen)
"What happens to Tabitha is worse" basically means she's supposed to watch her daughter (or one of her children, at least) die. I'd argue it couldn't possibly be anything else. A lot of people think we never saw Eloise death because she's alive and I too thought this at first. She probably was a story walker also, and I don't think story walking is that big of a deal, at least for now. MIY doesn't seem nervous about this at all. Of course, I do think Julie will hopefully do something previous cycles couldn't, but what that could be, I can't say. I think we haven't seen Eloise's death because of just how important it actually is to to the overall process of From existing. I say just her daughter dying because...
The son surviving is a part of the ritual that keeps From going. We are setup with the expectation that both children (son and daughter) are meant to die, and that Victor is maybe the first one that hasn't. I think we will find that the Son (or at the very least, one of the two children) must remain alive to act as the catalyst for the nightmares of the next cycle. We are lead to believe the ritual was incomplete, that two sides are fighting to either complete the ritual or to cancel it out, but I think we will find the ritual happened exactly as the "evil" team (for lack of better term) needed it to happen and every cycle since has gone perfectly for the evil side.
The only caveat here is i'm not exactly confident in how this plays into the "Kill the boy" plot from season 1 with Sarah. Did he know it was not possible but MIY did it anyways just to cause chaos and turmoil? Possibly.
<power gap, still working out what happens between 3 and 4>
- When you die, your fears (or possibly hopes) become manifest. At some point, Victor will sacrifice himself. His "fear of leaving" and death will be part of the catalyst that allows the rest of the towns people to leave. The purpose of Victor's dad being there is to give Victor the inner strength to make this decision (note: I don't think his dad will convince him to do this, but just being there will give Victor the inner peace and strength to make this decision for himself. I think bringing Victor's dad into the town will be one of the unique things that makes this cycle successful).
Still working on the rest. LMK what you think, I gotta go...
EDIT: After mulling it over, I think I know how "Kill the boy" plays into this. The boy (or, a boy) does have to die, its just not Ethan, it's Victor. What we've learned recently is the death isn't nearly as important as the mind-set of the person at death. The reason the cycle continues is because people are afraid the cycle will continue, and when they die, that's what they create and support through their fears. If Victor sacrifices himself being hopeful that his death will actually release them, to intentionally weaponize his fear against the town itself, it almost certainly will. Victor has to die and it has to be his own decision while he's at peace for it to be successful.