If anyone is keen on doing something to act on Light Pollution then you could always join Sydney Outdoor Lighting Improvement Society (SOLIS)
http:www.solis.org . If you think SOLIS is too Sydney centric then you could form your own local group, SOLIS can always offer advice.
In the long run it is likely that the starry sky over Sydney will be lost. The impact of lighting will increase despite any controls, the controls if introduced will slow the loss of a starry sky and give impetus to those outside of Sydney to also retain a starry sky. Even those revered Dark Sky locations will be effected - don't think it won't happen. I recently heard that it is no longer possible in the USA to find a location from which human produced light is not visible.
Don't think there is nothing you can do. Watch your local council for DA's or reviews of DCP's, that's when you can make a submission that they must read. Follow SOLIS on Twitter @SOLIS_Syd or Like our
Facebook page.
I have a copy of a film "The City Dark" I could organise a screening if there is interest, it's an early copy and runs for 90 mins - gets a bit boring in parts, it is comprehensive on the topic of Light Pollution.