Grouchy Imp said:
Makes sense. The whole premise of the Terminator franchise is based around time travel to influence the past (present) in order to change the present (future), so technically speaking each film causes a reboot of the timeline.
Y'know, I attempted to put the timelines together to either argue for or against Genisys being the one film that can't grow out of altered timelines, but then I read http://ew.com/article/2015/06/30/terminator-genisys-franchise-timeline-explained/ and...dear god, my nose is bleeding. I mean, I like Salvation, and would have been fine with a 'future war trilogy' that gave John/Kate/whomever is left a happy ending.* I liked Genisys, and didn't feel it needed a sequel, that Genisys was its own thing in its own timeline. But right now, I'm kind of wishing that Cameron just ended T2 with the cut ending so I wouldn't get headaches from this.
I think what's really telling is that time travel in the series went from a last ditch effort by Skynet (implied, if not outright stated in T1) to the point where in Sarah Connor Chronicles, time travel is done willy nilly by both sides, and even in T3, we can assume that by postponing JD, and with the T-850 killing John in 2032, the future was actually made worse, and victory no longer guaranteed. It kind of makes sense, if we assume that Skynet builds off more advanced 2000s technology rather than 1990s technology (which is actually a plot point in a 'quiet horror' moment in Genisys, how Skynet, if activated, will have access to T-1000 technology from the outset). So, yeah. Maybe a reboot is needed. Reboot, make it take place in a completely different multiverse, and end the story so airtightly that it can't have post-Cameron nonsense.
*A happy ending as in, if I was to pitch two films to follow Salvation, T5 would be basically everything leading up to the point where the T-800/Reese/Uncle Bob/T-1000 are sent back, and T6 would be a final victory over Skynet in 2032, where John isn't killed by the T-850, but still sends it back to deal with the T-X. The series is thus completed, John and Kate live happily ever after, and a loop stabilized.