I wouldn't argue Lucas didn't stink some things up when making the Prequel Trilogy, but at least it was his creation, he still owned it and hadn't yet handed it over to another media giant to do with as they saw fit.
While he won't have a lot of control anymore, I doubt that he's out of the picture completely. I'm sure they'll be using his notes and plans, especially for the Trilogy. So it's not like it will completely split off from Lucas' vision.
And do we remember what happened the first time Lucas let his story be scripted and directed by another person? The Empire Strikes Back happened. So did Raiders of the Lost Ark. So it can be done and his franchises' greatest successes come from that.
I welcome a Star Wars without Lucas' touch.
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