I've seen quite a few posts on the matter, but a few things need to be made clear and be brought to the attention of everyone complaining about this bit of news. This post should have you as excited about the futures of Star Wars and other Lucas owned properties as I am. Let's begin, shall we?
First, the notion that Disney only creates children's programming needs to be dismissed. Disney owns ESPN, and you don't see Mickey Mouse in the highlights of a football game, and Donald Duck isn't on Around the Horn. Disney also owns Marvel now, and are rounding up all the various franchises in order to continue to breathe life into the stagnant brand. You may say "oh, The Avengers was only so good because Joss Whedon made it", but in response, who funded him? Who hired him? Disney did.
Second, Star Wars is not some adult franchise. I know I have grown up, and for whatever reason, people expect the franchise to grow up with them. That simply isn't Star Wars. Why didn't we like Jar Jar Binks? Because he is a character geared toward children, the same way R2-D2 and C-3PO were when our generation was younger. Star Wars, aside from Episode III: Revenge of the Sith, is a "PG" franchise. It's not going to become some gritty film franchise like the current trend demands.
Third, George Lucas' constant tinkering with the movies is one of the major reasons people keep getting upset with Star Wars. Now, George is serving a role quite similar to the one he took on for Episode V: The Empire Strikes Back, and that is the role of a consultant. With the reins handed to life-long Star Wars fans, people that dreamt of making these movies their whole lives, you can expect that the Expanded Universe of novels will not be shunned. If you don't believe that a Star Wars fan will helm this project, please, refer to my first point where Disney correctly tabbed Whedon to give The Avengers justice.
Last, I grew up with Star Wars. I probably know more about the universe than you do. This isn't to brag, but to illustrate that if anyone would be worried about the delicate balance and the ruining of a wonderful franchise, it would be someone like me. Someone that has invested time and money into it endlessly. I am excited to know that the most recent Star Wars film won't be a relic by the time I have a child old enough to introduce to The Saga. It's cliche, but The Force is strong with Disney right now, and for George Lucas to hand over "his baby" to Disney means he is excited for the future as well. Don't be afraid of the change, as fear leads to anger, anger leads to hate, and hate.... leads to suffering. I sense much fear in you. Don't give into your feelings. Besides, speculating on the plot and other various aspects of Episode VII is so much more fun than complaining about the unknown!
May The Force be with you.