I personally don't see why anybody thinks that 7,8 and 9 would be better if Lucas was still in 100% control.
He created the universe that we all love, but frankly beyond that he's a fat bag of uselessness in my mind.
The prequels were a product of him being in charge of everything, and surrounding himself with "yes" men that just agree with all of his ideas.
He's a horrible director, he can't write dialogue to save his life. He depicts human emmotion like a droid would.
OK - I guess he deserves some credit for pioneering sprcial effects and sound. But that often seems to be his downfall as well, since he focuses on that more than story or relationships or anything human.
The original trilogy was better due to collaboation with others. Lucas has great ideas, but then they need to be shaped and helped along by others. Empire is widely considered the best movie because it had a FOR REAL DIRECTOR.
Furthermore, why is everyone stressed about what Disney will do to the EU? Under Lucas's watch the Clone Wars cartoon already took a giant s#*t all over some really quality EU material. Lucas doesn't seem to even care about the EU at all other than it makes him money. So Disney in my mind (at worst) will just do what Lucas would have anyway.
My guess is that with Kathleen Kennedy at the helm, she will at least give
some thought to the EU. I will bet it will mess some stuff up, but it won't be the total destroyer of all post RotJ EU.
But - like everyone, we have no choice but to wait and see. And I WILL be watching those movies regardless.