Could the building demolition be just for those smaller western-style buildings/facades next to the show stage? I would also be a bit disappointed to see the show stage go, only because I know how much Village likes to re-purpose existing buildings for new indoor/dark rides, rather than go to the expense of building entirely new ones. I understand the show stage is too small for a traditional dark ride, but it could always be extended (as I believe Scooby was when it was converted from Gremlins). Also, it could surely fit a themed compact coaster -- something along the lines of the Dark Knight coaster at Six Flags. As I've said before, this would also solve any noise issues.
Regarding any potential new coaster - lift hill please! I am not a fan of the intensity of launches, plus Superman is such a famous launcher already. And Australia needs a massive, suspenseful lift hill!