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I think they already do in the original ending. Like, the only reason they comply with it it's because they are blackmailed by them, I mean, whne they talk about it they talk like if they were being forced to or they wouldn't be together. Also, and this is more of a theory than anything, but I have the feeling that the ones that we talk to are not the parents, at least not in the dreams, because there was a moment where you talk with Amicus and he says that they had never talked to them except for the parental device, and when you get sleep at the school, you have a similar dream like when you talked with the shadowy dragon that presented himself like the monitor, but this time, like distorted and creepy (at least the music, that gave me a chill in the spine). So I started to think about it and in fact, it could be explained like the other playing everyone in order to sustain himself by feeding from the negative feelings from everyone. After all, it felt weird that when you accept to play by their rules, they revive you, but if not, you just die, but it would make sense if you were someone who had been playing against them all the time guided by the other, and then they gave you the chance to redeem yourself.
Terrible idea? How so? I mean, I know that humans aren't exactly without flaws, but it's actually in their best interest to behave and try to learn from adastrians and the rest of siblings, since their technology is far more advanced than ours, which would further the Earth's knowledge vastly. Even from a selfish point of view, it's good for humans, so I think they would behave, if only because it's in their best interest. And, well, there would be some resistance, people like Cato exist, but I doubt that they would get much attention after seeing all the things humans could learn, I mean, only the pills that extend the lifespan would be enough to justify a friendship between the humans and the rest of the siblings, even to the most selfish and proud of humans.
Well, I can't really say that's not a posibility. We are really a proudful species, sometimes to the point where we become arrogant. At first, I thought about the parental devices as being impossible to reproduce, after all, their abilities are simply too good to believe, but now that I think about it, there was a point in the story where they said that Khemians were close to replicate the travel methods that the parents entrusted the siblings, so I guess it's not actually that far-fetched. Also, I think there are two ways that could go that, I mean, humans could be so sick of people in charge that they might give adastrians and other siblings the chance and help them overthrow the rulers, or would be against a new ruler even though this one might come with benefits in the long run. Also, now that you say it, that might be why the Earth was once contacted but we lost contact. Also, I wonder if we would have the materials to replicate the parental devices, after all, we've been using the resources on earth for millenia and we haven't come across with things that could harness that power, so, maybe in planets like Khemia and Adastra they have materials we can't even dream of, which would make our try to replicate the parental devices fail, which would be the best way to ensure that bleak future you talk about not happen. I think that would be the only way to prevent humans from creating mass destruction weapons in case they would join the Galaxias. That or even the fact that parents could withdraw their help to us in case we went crazy with it, like it happened to Adastra at the start of the story, where they were left alone from the rest of the civilizations due to their actions, so, I think they might have some ways to stop us humans if we went on that route, like isolating our planet once again. But being honest, looking to the world how it is right now, I think we need the Galaxias desperately, if only because of that, we need to behave if the chance comes knocking at our door.