Back in 1977, Dolby Stereo was considered a "gimmick" (one of the reasons that so much effort was put into the mono mix). If you listen to the theatrical Dolby mix now - the star destroyer overhead, the blaster bolt bouncing around the trash compactor - you can hear that Burtt was having fun playing with his brand new (expensive) toy.

Star Wars wasn't the first Dolby Stereo film, but it was the one that showed what the technology could really do. This original experience is an important event in movie history, and should be preserved as such - it should not be brought up to date with CG additions and retro-added 3D effects.