Why hasn't that happened with Marvel? Captain America: Winter Soldier involves Cap going against SHIELD who were set up as the good guys since Iron Man and has radically changed the Marvel Cinematic Universe and as a movie was extremely critical of America's current policies regarding war. You'd think a corporate run movie would just have Cap fight a badguy, roll credits and expect millions in the bank. They're also releasing Guardians of the Galaxy which is obscure to comic fans and involves a talking raccoon and his friend who is a tree. It more than any other Marvel film has the highest chance of bombing and its the last film before Avengers 2.Disney just wants to make it corporate friendly, and almost certainly watered down for the fans who don't regularly read anyway. My favorite SW writers would be no match for Disney. They worked when they weren't put on a leash by interfering, incompetent corporate minions. No good writer can work in the environment Disney is setting up. I don't begrudge good authors writing for Disney Wars (its their job to write) but its all guaranteed to be horrible. It literally doesn't matter who is writing what, the whole universe is broken by the very concept of rebooting it to go with JJ/Disney Wars movies.
I really don't you have any idea of how Disney runs as an organization because at least with Marvel they seem to actually listen to both the fans and mass audiences, so the movies appeal to both. Lucasfilm has already announced that they are going to film using actual sets and animatronics instead of relying on greenscreen and CG characters due to it being one of the biggest complaints about the prequels, other than the lack of a plot, horrific dialogue and desire to feel as much of the screen with pointless CG crap to the point where you're so distracted you don't care anymore.
So give it a chance, you've decided it sucks before the trailer came out because you hate Abrams and Disney for some reason. Do you honestly think that Lucas would make a better movie?