I like the way you have approached this topic. I pretty much agree that this is one of the most ridiculous ideas I have ever heard of happening at Disneyland. Aside from the argument of fundamentally altering Walt's park, the Star Wars area is simply going to be this bizarro alternate universe behind Frontierland. One is going to be strolling the wooded trail past Big Thunder and happen upon a Star Wars themed scene??
I have often maintained that the conflict nature of the Star Wars sagas make the property is less desirable as a theme park environment as the majority of production was centered around creating forbidding and inhospitable locales for the drama to play out. About the only two places I would have wanted to visit in the Star Wars universe are Naboo, and Endor, (which I can visit in person if I just drive up the coast a bit). I realize that audiences are drawn to the excitement of the action and the appeal of the characters but that's only half of the equation. My worries are that a Star Wars land is going to end up being as depressing as 1998 Tomorrowland.
In a way, I had always hoped that Frontierland would have received a new frontier-themed dark ride attraction to expand the offerings. An updated version of the Western River Expedition would have been a great fit for the area. I suppose if the Star Wars franchise falls into disfavor they can always remake the area into a somewhat unusual mining camp.