Ok, kneejerk complaints about image quality and Prequel era content aside, keeping the original destination and adding the new content into the roster makes perfect business sense.

The last Star Tours I was at was the one in MGM Disney Florida back in 2001. IIRC, there's four shuttles you can get in but right now they all go to the same destination. Multiple destinations now means that you can choose where you want to go depending which shuttle you get in, effectively just like a real airport.

That means more people will be going through the ride multiple times to get to see all the destinations instead of just coming back for the same one over and over.