I hate to say it people, but the only thing that will get George Lucas to release the Original Trilogy on DVD is lackluster sales of the September 21st release (not going to happen) or an overwhelming popularity of bootlegs of the Laserdisc copies on the Internet.
George Lucas has proved that he's more of a business man than a director. He'd change his mind if he felt there was enough financial opportunity involved, even if that meant he would put his ego asside.