Beat it last night. Got a little teary eyed when Shulk and Rex gave their life force to free their kids from the cycle.
Well akshually, they didn't really give their life force, I think. They became part of Origin/trinity and used their powers to wipe off the lifespan tattoos, which is why A calls it "cheating".
I agree it is incredibly bleak to see your kids die in a cycle over and over. Rex and Shulk seem ageless from the time they would have arrived on Aionios. Linka says in a vague but meaningful way that some of the folks were "chosen" by Origin. It makes sense that if Origin was capable of allowing people to spawn Zed and the moebius, that it would also allow a counter measure (for any wrinkles that come up) to spawn. We could probably go into a big "free will of the people" discussion here but I think of Origin as the original trinity processor on steroids + 2 planets of people turned into core crystals, with Nopon mechanics putting it together >_>
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Donny: Are they gonna hurt us, Walter? Walter: No, Donny. These men are cowards.