Regardless of opinions,
The purpose of a franchise film is to increase or sustain its audience each film. A highly polarizing film doesn't do that. This film is highly polarizing hints the arguments and disagreements about this film. While sometimes it good to change things up, you don't change things to the point where hardcore fans don't enjoy it because they are the ones way more invested in the series than the fickle causal fans.
While you can argue oh people hated it because it didn't turn out how they wanted. Well, as a customer if I'm paying for a product which a film is, if it doesn't work how I want it, i should be allowed to be upset? Disney isn't making this films for artistic purposes, its pure financially beneficial to the company.
This is going to be a key point of contention upon release of the next film. If this was a standalone, it would've been fine but unfortunately it is not and if Disney does not get those fans who didn't not enjoy this film on board for the next film, those who invested the most in these series will go down which is a huge revenue loss in the long run.