ok, here's my $.02 cents and an answer to some questions....
ILM invented a computer for CGI and dubbed it the PIXAR computer. As for starting Pixar, Lucas did not...they sold the technology and the name. To prove the idea of this, Lucas wasn't ready for CGI/Dgital until 1996 when he made changes to his films.
As far as making it HD, that means nothing. The attractions as Disney that use FILM can crush HD, HD's limits are at 1080progressive....film is theorized at more than 4 times that. Captain Emo, which was 70mm, was even better than that. I'm not sure if Star Tours is film or video based....and belive me, it can be film as most motion rides used a system where the projector was stationary and it was filmed with the ride in mind...so the image would move around. There are a LOT of projectors around Disney's/Universal's properties. To name a few; Tough to be a Bug, Hall of Presidents, Haunted Mansion (they were, not too sure if they replaced with video), Terminator and Back to the Future @ Uni, Captain Emo and Horizons (15/70mm Imax Dome) for those who remember, Phillharmagic, and the list goes on...
Lucas may preach about DLP technology, but it's definately not stable enough to run all day everyday ona ride, they had problems at ShoWest with ONE show; I saw the Incredibles @ Pleasure Island and the show locked up twice, then has to switch to the print that was running in tandem.
Maybe I'm just a film geek (I work here up @ school as a projectionist) and I realize how much technology Disney has used in the past/present, but they have HAD the technology for years and it just comes down to $$$. Also, the Star Tours's footage is 1/2 ripped from the films anyways. And isn't the contract for Star Tours only for that ride. Funny how MGM/Disney have the rights to it when he could go elsewhere after the ride is done....but he won't.