And the problem with Salvation which was really the best place to go for the franchise is the writers couldn't crack writing a story about John Connor. The whole premise of Salvation was pitched as a Marcus story and John Connor is a minor character and then John Connor dies and Marcus BECOMES John Connor to give the people a savior and legend to uphold and prop them up and get behind to win the war.
It sounds like they brought on Jonathan Nolan to heft out the John Connor parts, but it still felt like Marcus's story. Marcus is the audience's surrogate and window-in character for the movie. He's the movie's true protagonist. They simply added in some John Connor scenes to round out his role, but they feel shoehorned and badly integrated.
The original writers of T4 were writing a movie about Marcus and like human/cyborg hybrids that took over the world and were the real Skynet. I mean that's weird and all but it's also not Terminator. Skynet is/was a self-aware AI program. It's a thinking/learning computer. It's not the tool of a group of human/cyborg hybrids who are trying to get dominion over the earth and like create a goofy utopia where they have human cyborg orgies and do whatever they want.
The problem with the new human/cyborgs being in charge is basically that it ruins Skynet, something else the writers couldn't figure out.