Yes. And sometimes sequels and/or prequels aren't nearly as good. Just like there was a sequel to the 1978 musical movie adaptation of Grease and after it was a massive hit, they gained a sequel called Grease 2, but sadly that sequel went below expectations and didn't have the stars John Travolta and Olivia Newton-John from the prequel. And why less than 1% of Disney movies have cinematic sequels or prequels is probably because they want fresh new ideas rather than some extended timeline of something already existing and then it tends to feel repetitive but also kind of changes the story too much. I do kind of want to plan to see Wreck-It-Ralph: Ralph Breaks the Internet, but it probably to me won't be as good as the first one and I feel the first one which I enjoyed already had a pretty happy ending to end a story, but sorry to spoil it for some people whom have never seen the first W-I-R. Sometimes sequels or prequels or midquels are better left to fan fiction and stuff. Plus budgets to making new movies are a lot higher today than they were then, and they can't always be spending money making prequels or sequels to something already in existence when they could come up with jillions of new ideas from scratch.