Im gonna write a long one here so bare with me: Star Wars was never meant to go past its first movie. It was an happy little accident.
The OT was not hatched by one person, but a group of people working together. (David Lynch was supposed to be the director of RotJ, which would have been amazing)
The prequels showed that GL was not meant to be the only creative force behind the SW.
The current series shows the failure of leadership. It could have been KK, JJ, RJ, Disney, etc.. Realistically it was probably a combination of everyone's fault. The OT had a creative group of people working together. This is a creative group fighting each other. Disney was probably overbearing because its cool child, the MCU had made 5 billion movies and stuck the landing, while its weird child SW can only make 1 out 5 movies smoothly. KK has to have some blame. She is the head of LF and has some responsiblity, she clearly made some bad hiring and either was hands off with the series or hands on. We will never know, but to me it seems Disney is making moves to pin it on her. I'm not saying there going to fire her, but moving in their favorite son, Kevin Feige, is interesting. JJ deserves a lot of the blame, his writing it terrible, but here in Era, he getting too much. Him and RJ didn't want to do the last film, I can assume they didn't like working with Disney or Lucas Film or both. RJ also needs to have some blame. I understand a lot a people like TLJ, but you have to acknowledge RJ made some dead ends to get around JJ dead ends. TLJ doesn't have any of the main characters in a scene together and making more poetry with empire vs rebals and Kyle vs Rey, the third impact. They also put a lot of stock into Leia's character, which was just unlucky. For Kyle Ren, I believe Disney never liked him being the final villain. I don't know why, maybe they didn't like his face or something.
In the end, I think truly Disney unimpressed with SW slow and messy output and is mostly at fault for this messy trilogy
Honestly, I don't know what KK does and don't know if she deserves a lot a blame, but KK has lot a fault to for not planning well and bad hiring. She is the manager and the gets the punished by the big boss.
As for for the directors and writers, they get some blame, but I can see a lot of finger in their pies and had to deal with a lot of corporate bs. They get a lot of unnecessary hate from both sides.
No Martha Lucas, no franchise.
Kathleen made 2 missteps? I am sure she will be fine her first production was Et and she made a few tiny films since then before SW.