One thing that can be said about the Terminator series is that it has gone through many (soft) reboots after the first three movies. After Terminator 3, it took 6 years for them to release a loose sequel to the predecessor with Terminator: Salvation. That film had Christian Bale, former Batman star, taking on the role of John Connor, the leader of the human resistance. While it is the most unique of the films, it hasn’t been the most successful. For the fifth film, titled Terminator: Genisys, they have decided to bring the time traveling elements back.
Terminator Genisys has turned out to be a massive disappointment even with Arnold Scharzenegger taking back the center stage as the titular cyborg. They made a mess of everything including the cast. For instance, the role of Kyle Reese was definitely miscast. However, the stories and the direction the have went with it was really insulting. They were hoping to continue the story with the sixth one with the exploration of the John Connor cyborg. Although to be fair, people who paid attention to the first film probably wouldn’t feel that this has come completely out of left field. In The Terminator, Kyle Reese was about to say that John Connor died before the war was done.
This is not the first time that they have decided to change directions. It is highly likely that the original sequel for Terminator Salvation was a lot different from Genisys. As a matter of fact, Salvation was meant to be the first in a trilogy that focused on the future war which would lead to the time travel of the characters. Terminator Genisys has decided to condense all of that down into an opening sequence which would result in a film that would spit in the face of the Terminator franchise as a whole. As of right now, they are working on a reboot with James Cameron being consulted. This means that there is a chance that there might be a decent Terminator reboot.