In my opinion, no matter what kind of movie or game, or even a series of products such as novels, in reality, they will have their own area, in which people will actively discuss or promote their favorite content and try to let more people know what they like. I call them community culture.
The community plays a vital role in the success and influence expansion of an IP. People in the community are not only the main consumers of the IP, but also its disseminators, supporters and creators. They can continue to produce derivative works of the IP, whether they are illustrations or animations made by themselves, or even the birth of games. These are immeasurable for the growth of an IP. No company manager can predict when the next community work that can attract a lot of social attention will appear, but once it appears, the benefits it can bring to the IP are immeasurable.
For example, Cas van de Pol (https://www.youtube.com/@cas), who makes personal videos on YouTube, most of his videos are some resets of movies and TV shows. He has attracted many fans through his personal style and a lot of changes to the plot.
Not long ago, he made an animated adaptation of (How to Train Your Dragon) and added a funny dance to it. It was this dance that caused the video to spread like a virus. In just one day, it received a very high number of views on video websites around the world, and the original movie once again received a lot of attention.
（https://www.youtube.com/watch?v=9MCiixIkzUk&t=34s）
（Funny dance produced by CAS）
The community is like a catalyst for the development of an IP. Even if an IP no longer has as much influence as before due to the passage of time, as long as there are authors like Cas, the IP may regain its influence at any time. This is a very positive development.