I am still thinking John isn't a big deal anymore. Perhaps he is still coded into the Terminator's brains as destroy on sight, if they have a shot at him, they might as well, but if it was their primary mission, as it was Cromarties, then he'd be dead by now. From what we have seen, there are a lot of robots out there, but we have no evidence that they are after him. I think we have moved onto bigger things than one man and the actions he makes that ultimately win the war. T1 Terminator was a last ditch effort by the machines on the verge of defeat. In the alternate future, any number of things could happen differently.