The terrible truth about franchise filmmaking is that not every great idea will support endless cinematic successes per year. It doesn't mean that studios can use its iconography to guarantee their earnings for the next decade or two. Sometimes pushing a story beyond its limits ruining what was once great.
The Terminator and T2: Judgement Day are excellent films that may elude an uninformed observer, but repeated messy attempts to exploit their exploits have proved that the creator's original intent was incorrect.
Terminator: Dark Fate is the latest installment in the long-running franchise, which may be a painful process. It was almost immediately canceled, it failed to meet its box office expectations, and it received mixed to negative reviews. The filmmaker, late of Deadpool, has come out to defend the film's disappointing performance, but he sees its failure as a lesson.
The film was launching into a race with a limp as a result of the back-to-back disasters of its franchise. James Cameron was one of the five film writers credited, while modern sources suggest he took a more active role in the film. Their objective, as it has always been, is to restore people to the two films that they loved.
Terminator: Genisys is a considerably inferior film than Dark Fate, yet it made quite a lot more money. It's hard to argue quality when considering a film that was immediately rendered non-canon by its sequel. However, those who saw it at the time probably heard him slam it out loud, describing the entire problem with the franchise since 2003.
The Terminator franchise should not be erased from the timeline of the good old days, since everyone still saw those bad movies and lost any trust they once had for the franchise. The other films are bad because they put quality before tail-chasing continuity obsession and lazy financial callback-centric filmmaking.
The best way forward for the Terminator franchise is to hire a team of complete newcomers and go through the films like an autopsy to piece together what's worthwhile. No film deserves more than dull retreads of a film that everyone already knew was excellent 30 years ago. Either let new creatives find interesting new directions without the burden of continuity or let the franchise die the peaceful death it's been hoping for since the 2000s.