I feel Star Wars could maintain two timelines.
I love Star Wars especially first six movies plus the Expanded Universe (now called Legends). I feel a way to fix the franchise is two let it have two alternate but equal timelines one would be for Legends and one for Disney's canon. The only thing these two universes could have in common are the Original and Prequel Trilogies everything outside those movies events and stories become much different depending on what timeline they are in. They don't have to have crossovers where Legends Luke meets Disney canon Luke, just let there be two timelines for fans to enjoy.