The main goal of the cinema industry is to make money. Hollywood producers are not focused on art, they only want to increase their profits. No wonder so many modern movies leave much to be desired. Big movie franchises used to have a logical and satisfying end. However, every successful movie series gets useless sequels or reboots nowadays.
The Terminator franchise is the best example of this terrible approach. The cult 1984 sci-fi action film received a wonderful sequel. However, then it got four extra movies that it no one asked about. In 2015, Terminator Genisys seemed to give the cult franchise an end. Nevertheless, it continued in 2019 with Terminator: Dark Fate, which effected a retcon of the previous films. Terminator fans were not happy about that.
The same happened to the 2018 slashed film Halloween. It is a direct sequel to the 1978 film of the same name. It ignored most of details of the previous sequels. Laurie Strode is alive and well in this movie despite the fact that she has died in the original series. This confused many fans of the previous movies.
A franchise reboot is not only associated with the Hollywood studios that are trying to make money off popular movie characters. Usually, rebooted films utilize the modern computer-generated imagery. As you probably know, some reboots have serious problems with CGI.
The good old horror movie A Nightmare on Elm Street with Robert Englund was a lot better than its new version with Jackie Earle Haley. In the reboot, Freddy Krueger lost all the things that made him one of the most iconic villains in the world.
The 2019 sci-fi movie Men in Black: International is another example of a bad film series reboot. Most of the people did not like this pointless reappearance of a cult franchise. No wonder it failed miserably at the box office.
These are far from all movie franchises used to earn money. You can easily add plenty of other films to the list. However, the only way to prevent a cult franchise from failing is to end it at the right time. Too bad Hollywood producers only care about money, so there will definitely be more rebooted films in the future.