just to clarify which war is which. The war that started at the end of t3 ways the war called judgement day. The war that is referred to in t1 and t2 is the war against the machines. Sarah Conner's V/O at the beginning of t2 explains all that. Judgement day was the nuclear war that killed 3 billion lives in one day. The war against the machines started sometime after that. But you're right t4 would be a bad idea. t3 was bad enough to kill the franchise