Theming should be relevant to the context of where the viewer is standing. I'd say that's pretty much 101 basics when it comes to Disney theme and design of their parks. If you're in Fantasyland, most of what you see should be Fantasyland.
So what do you do if you have a ride that peaks over sight lines like Space Mountain, the Matterhorn, Guardians of the Galaxy at DCA (formerly Tower of Terror)? You do one of two things, you build future theming in mind to hide or compliment those broken sight lines, or you just accept that it's a big attraction and it's unavoidable you might see the white steel cap of Space Mountain in another themed land. If that weren't the case, then you'd be theming the entire park to the largest visible ride, which is kind of nuts when you think about it. If that were the case, then the whole park would be themed to Tower of Terror, much like Sea World would be themed to Storm or Movie World Rivals.
Therefore the arid-desert/snake theme works well in the context of Steel Taipan's courtyard. Outside of that space it doesn't make sense. It doesn't make sense on the walk to Giant Drop and it's really not needed here. A basic colour with some climbing figs or vegetation would be far more appropriate in the context of City Hall/Dreamworld's entrance.