I don't know what a new "show set" might mean for GMR, but I do have to admit that I might not be completely against a Star Wars scene replacing Alien if done correctly. Specifically a recreation of THIS iconic scene from Empire Strikes Back (ESB has well earned its place as a great classic movie, and it's generally agreed to be the best in the series)-
A pair of impressive Luke and Vader animatronics dueling could be super awesome to look at. Something similar to this was actually done in Disneyland Paris' version of Pirates of the Caribbean, there's a new scene exclusive to that version of the ride where a pirate and a guy from the town (who almost looks like the inspiration for William Turner) have a sword fight. It's rather impressive even to this day, and that was a ride built over 22 years ago. I could totally see a lightsaber battle using the same sort of AA technology to make it look like they're really fighting (perhaps with even newer AA tech).