The concept of Terminator is to mix the future with the present. That mankind has selected a leader for a rebelious resistance against an Artificial Intelligence via machines that can think.
The Terminator
1984
Judgment Day
1991
Rise of the Machines
2003
Salvation
2009
Genisys
2015
Dark Fate
2019
Future
The future of the franchise is unlikely, but the series is open to further installments because of the developing artificial intelligence