...from a certain point of view.
The way I've heard things, later arcs of TCW were going way overbudget, and George (Lucas) was often financing them out of pocket. When the Disney acquisition happened and Lucas left, the decision was made to shut down TCW in order to funnel resources into sequel trilogy content.
I completely disagree. "Lost Missions" Clone Wars had some of the best SW storytelling we've ever gotten. I'm confident that - had the show continued - we would have seen absolutely amazing content in seasons 6, 7 and 8.