Disney and Star Wars

I admit, I initially winced when I heard about Disney's buyout of LucasArts. I expected it to be equivalent to the "Merchandising" scene in Spaceballs. And then I thought about it some more.
1) Merchandising

Disney is the king of merchandising and waste of time tie-ins. Shirts, dolls, toys, and breakfast cereal tie-ins are all par for the course for the Walt Disney company. Their games tend to be particularly simplistic and not particularly good. Disney relies more on marketing than quality in order to move units, meaning they might not be particularly interested in making high quality products.
What we're all afraid of is this:
But what if I told you that toy line came out in 2010? Lucas and Disney have a long history of working together, even coming up with a ride called Star Tours. The IP has as much silly as serious, and the Star Wars Christmas Special certainly didn't stop us from taking the IP seriously. Provided Disney brings the same even hand they did to the Marvel acquisition, I doubt the merchandising will have any toll on our perception of the series as a whole.
2) Declining Quality
Disney has a habit of shameless self-promotion. One merely needs to look at the string of direct-to-DVD sequels to a title to watch its decline. I'm a bit concerned that Disney won't be following the Thrawn trilogy with Episodes VII, VIII, and IX. That being said, they handle IP very well when they intend a mature audience to be consuming it. They've handled the acquisition of Marvel beautifully, and I haven't seen horrid products come of it yet. Epic Mickey was another example, taking a gamble on Warren Spector's fantastical concept of Mickey in a dark world. Meanwhile, nearly every Star Wars video game has been beyond terrible.
3) Aging Actors
The actors are getting a bit long in the tooth, leaving Star Wars potentially in the hands of animated characters and creating a departure from the classic live-action present in the Star Wars trilogy (and the 3 prequels Lucas tacked on). This either leads to a King Conan-esque story, or perhaps use the actors to place faces on younger bodies. It certainly can be done, and if anyone has the technology, it's the two best digital effects studios on the planet -- Pixar and Lucasfilm.
4) Ignoring existing IP
For quite some time, fans (and LucasArts) have regarded the Thrawn trilogy as Episodes VII, VIII, and IX. Lucas' studio has confirmed that these will be new stories. This marks a significant departure from nearly 40 years of comics, movies, and books. Divorcing the universe from the Expanded Universe simplifies the source material and IP, but it effectively eliminates the entire idea many fans have of existing canon. In lieu of a single father controlling the product, the Star Wars fans have decided their own idea of the product. Lucas long ago accepted that Star Wars belongs to the fans, and this is the only significant departure. However, much like the Marvel Movieverse, I expect writers to loosely follow plots that are important to the fans with at least a gratuitous nod -- much more than George Lucas himself would have dared consider.
5) Retconning
Remember how the song Arabian Nights informed the listener that Arabs "cut off your ear/if they don't like your face?" Can't find it in the DVD version released more recently, or your 1993 VHS tape? It went the same way as the fight between Han and Greedo. That being said, Disney's cuts are not there to change the tone of the film or its characters, but rather to modernize the source material to avoid offensive content. The tone of the song remains the same -- something that can't be said for Lucas' editing of the swashbuckling scoundrel Han Solo.

Conclusion
At the end of the day, Disney can't do any more damage to the IP than Lucas has already done. If you've sat through all of the terrible games, terrible merchandising, and terrible edits and you're still a fan, Disney's worst is about on par with what you likely consider Lucas' best. The helm of the Star Wars franchise is the same person Lucas had picked to continue it when he initially discussed continuing with Mark Hamill. If Kevin Smith has hope, you should too. After all, Disney's treatment of Marvel has been pretty dang decent.

I find your lack of faith disturbing.