There's really only one area left to cover. We know how things started; we know how the future war ends; but what happens after SkyNet is defeated? Surely there's more to it than sending back Hail Mary terminators.
You want a movie that takes place after the Big Bad is defeated? That's kinda like a movie taking place after Return of the King, isn't it?
wouldn't the movie basically be watching humans rebuild? that doesn't really scream Terminator movie to me.
I say: reboot. Why not?