Yeah! Anti-parallel fist-bump! (Okay, this emoticon is called facepunch, but it works for this, too.)
I always thought the idea of an infinite number of bad endings was depressing, too.
Edit: Okay, here’s what I’m thinking now: There’s only one “true world.” (Umineko spoilers) This is true in both Higurashi and Umineko.(Although of course, there’s a mundane explanation for everything in Umineko, but not Higurashi.)
But wait, then what about the Sea of Fragments? Well, the Sea is a place of abstract possibilities. Even in the real world, alternate possibilities “exist” in an abstract sense. But the whole point of witches is that they’re beings who can experience the abstract as though it were objectively real.
So Hanyuu’s power is that she can cut out a chunk of time and shift it to a more abstract state of being, so the “parallel” worlds are all just possibilities, and none of them will become fully “real” until Rika wins (or gives up completely).
(Umineko spoiler) Also, when Hanyuu does this, she’s effectively placing that chunk of time into “witch territory,” which is how it gets adopted as a “witch’s game.”
But that leaves us with the problem of how the worlds apparently continue after Rika and Hanyuu leave them. See, I think these are just representations of what “would have happened.”I do think the world continues for a little while after Rika leaves it (like, a few years, tops), but after that, it gets replaced by the next “possibility.”
(Saikoroshi spoilers) Well, what about the “perfect world” in Saikoroshi? Well, we don’t know if this was just a dream Hanyuu showed Rika or not, but even if it wasn’t, I think it might be able to work as a fluky “possible world.” So if Rika had chosen it, it would have become “real.” That’s why she thinks to herself at the end that she “forced her friends’ sins on them” by choosing her original world (Her saying this makes absolutely no sense if we assume the worlds are completely separate, by the way.)
Or there’s that scene at the end of Matsuribayashi where Frederica changes Miyoko’s fate. But again, Frederica is a witch, so she can play around with “possibilities” all she wants. Also, Ryukishi has said that the point of this scene is pretty much just to get the viewer to think about the fact that if this one child hadn’t been abused, then the tragedies of Higurashi might never have happened.
This also explains all how characters can be the “same people” from world to world, which is critical to my enjoyment of the story (Plus I think there’s too much evidence in the story itself to ignore).