The script was always the problem. The writer could never decide if he wanted to be faithful to the original Louise Fitzhugh novel or not. Since nobody knew really knew the book, Nobody's Family Is Going to Change, the creators should have been bold and veered far from it. Instead, all they did was tame her ending, pleasing nobody.
In the original story of a Black family, a lawyer father hates that his overweight daughter wants to be a lawyer while his son wants to be a tap dancer. No. He won't have it. He draws a line, and they cross it. The kid becomes a superstar, who becomes bigger every year, while his sister becomes his attorney. They basically ignore their father, because they knew, as they sing in one song, "we were right all along."
I don't know that adult audiences would want to see that. But if that's the case, why not keep working at it and create something really new?