Disney has spent the last eight years ignoring the perfect animated movie franchise, even though Big Hero 6 was a major box office hit. Disney has had an increased focus on franchises in all departments of its movie studios over the last few decades. Whether it was the success of the Marvel Cinematic Universe, relaunching Star Wars, remaking animated classics in live-action, or expanding Disney's animated movies, they have all played parts in creating new franchises. In most cases, it is easy to see why Disney decided to move forward with franchise plans for certain movies and ignore other opportunities.
https://screenrant.com/big-hero-6-disney-franchise-perfect-ignore/