What really baffles me about the Terminator franchise is they have never properly explored the most obvious option, the future war. One of the producers on Genisys said that online opinion was people wanted to see the future war so they did the biggest future war sequence out of all the movies. So if that was online opinion why not base the entire movie around that? Salvation sort of done the future war but it was very different from the flashback sequences, plus the movie barely had any terminators at all.
Just find it hard to understand why they insist on going back to the modern day setting, as invariably comparisons will be drawn with T2. A proper future war movie could give them far more options than the movies have done to date, yet for whatever reason they keep going back to this modern day setting. Suppose its possible that if this movie is a success the next one will take place in the future, remains to be seen.