✔ 最佳答案
I have to believe Disney and Pixar both want to make the very most they can from every film they make. At least two years passes when a movie is released, then two more years on DVD and now streaming service. Then they have to take a few years writing the sequel, production planning, and finalizing the making of the movie.
Once they have exhausted every way to make money from a movie, Disney wants more money, and the only way is to make a sequel. Disney and Pixar have multiple movies going at the same time or within a year from the other. So, the process has to begin each time with each movie.
Remember too, Disney purchased LucasFilm just seven years ago, and they have already started the Star Wars rehash. Just look at how much George Lucas squeezed out of Star Wars. I'm talking about movies, cartoons, documentaries, specials, books, magazines, etc... Raiders of the Lost Ark will probably be rebooted with a new Indiana Jones now too.