Probably too much energy to expend on this movie, and it's a speech I'm sure I've made before, but...
Why does everyone in charge of the Terminator franchise miss out on the best theme/focus of this world? The only incarnation that even approached to getting this right was The Sarah Connor Chronicles, which I know many didn't like, but I thought was solid for this reason:
Make these movies about the Time War, dummies!
In T1, the time machine was a one-off. The machines sent a Terminator through, the humans captured the machine and sent Reese through, and then they destroyed it. Game over, one-shot movie. After it was established in T2 that this wasn't the case, and that both humans and machines had access to time travel, from that point forward the whole franchise should be about the chess match that is played between humans and machines trying to one-up each other and gain advantages in the war to come by eliminating people who would become leaders, stockpiling materials, recruiting, or trying to stop Judgement Day from ever happening to begin with.
That is incredibly fertile ground. It's not all about John and Sarah and frickin Arnold. Do a one-off movie where the machines send robotic agents back to establish some sort of pre-JD stronghold that can go active as soon as the missiles are launched to take out some critical human stronghold, so the humans send back a team to take it out. Tell a story of paranoia about some human turncoats who agree to infiltrate the Resistance for the machines. Hit on things like in TSCC where there is some sort of schism/underground within the machines. John sending guys back to save his future leaders and comrades from the machines, and to recruit them to a cause that doesn't exist yet.
I think it gets even more interesting when you establish that sending anyone back creates parallel timelines (as in TSCC), so you can't even affect your own future, but just the potential futures of other timelines. And, you get different futures converging in a common past, which lets you mix things up and keep the future fluid.
It's a 4D chess match, but all we get to see is "come with me if you want to live" over and over again. Lame.