And now we're done.
As soon as Ben plunged into the cornfield, I was like, "Oh hey, we've been here before!" I also called Jonesy dying, after he had that touching scene with Libby. I didn't call how, though. Also, let's hear it for Norman.
I like the full-circle bits: Ben moving into Management's spot, and you can almost see Osgood taking over for Jonesy.
So as I read it, the avatars' kids take up the opposite side (Melnikov fathering Justin fathering Sophie, while Scudder fathers Ben). But while they are "opposite" it's not all that clear which side is which -- if this really is a battle between good and evil, and not just a long-running battle between shades-of-gray powers. Sophie's the last one, though, since I don't think Ben's got enough time to get a kid started.
My guess? Ben and Sophie would have met again, and been unable to fight, and left the world together, thereby ending the cycle.