As a producer, Kennedy has an amazing record--if you grew up during the 80s, she was behind a lot of the films you loved. She also has been behind a lot of Spielberg's Oscar winners. The reason we know about her as the lady who ruined Star Wars is because YouTube video essays became a thing right around when the sequels came out. Otherwise, nobody would know who she is.
I'll be contrarian and say that her legacy--in terms of people watching her films--will probably last longer than Feige's. That and Disney's insistence on putting out films so quickly after buying the IP is as much to blame as Kennedy for the er, uneven, record of the Disney-era movies.