No it will not. That system would not work here for a number of reasons. Mainly because we do not have city or county based services. Each state has only one police force (despite the fact they are encrypted) not several like in the US, each state has only one ambulance service and each state has one urban and one rural fire brigade. It would be too complicated to set it up because emergency service repeaters overlap numerous towns, cities, municipalities and locales.
Another problem is support. It would require way too much to set up a website and have someone available to keep things up to date. And lets face it, RR is near on useless for anything outside north America.
R
There's no reason it couldn't work. However, I doubt it will be there - at least for the first version - for one specific reason - backend work. Before the first location-based scanner came out from Uniden (was it the 396T/996T line? I forget), there was a
huge project to populate all of North America with location data in the RRDB. People were asked to submit proper position information for every frequency and system in the database. This took months to accomplish and even to this day there are still some places needing work (I found a few a couple of weeks ago).
The postcode/zip code info is in a file called something like CityTable.dat (I don't have either of my x36 radios hooked up to my computer right now, or I'd be able to check). There are positions for every zip code/postcode as well as every major city in both USA and Canada. The file is of a proprietary format so I can't add to/modify it, but it stands to reason that it is almost infinitely expandable, simply by adding the country "Australia", loading the centroids for all the postcodes (IIRC, that data is available from your postal service, for a mild fee - I checked a few months ago when I was contemplating modifying the file myself), and doing centers for every city (a pretty daunting task but the data is out there somewhere).
In my opinion, the fact that your emergency services are statewide has little impact on whether or not location-based scanning would work in AU. There are many states and provinces in North America that have statewide trunked radio systems, for example, and use location-based scanning just fine. Each tower site has its own position and range data in the RRDB, and the talkgroup groups the same (a "circle" representing the area they are supposed to cover). For the truly "statewide" talkgroup groups, it's not uncommon to see the group have a position marked in the center of the state with a range that covers the entire state (or even multiple states in some cases).
In my opinion it would be tremendously useful to update the AU part of the RRDB with position and range information for everything that's in it. If you build it (the data with which location-based scanning would become possible), it just might come.