At the time of the acquisition, The Clone Wars had just finished its 5th season, Ahsoka leaving the Jedi Order cliffhanger and all, only to be canceled.
This all changed with The Clone Wars animated series, where the clones took center stage, serving as the heart of much of the show.
Thanks to Star Wars Rebels, Dave Filoni was able to return Ahsoka and the clones to the forefront, giving them character arcs that finally wrap the thematic questions of The Clone Wars, while setting some of them up for a new direction.
Star Wars has seen the release of some great new content in the years since Disney purchased Lucasfilm, but one big loss has left a number of stories dangling for years.