Unfortunately these days noise complaints are basically driven by greed. People want to buy a cheap house, then if they can get the airport shut down they will double their property value. This is especially true in places like Kurnell and Sydenham in Sydney. The airport has been there since 1920's but people think they have some right to move the airport. Same now in Canberra after the geniuses in Macquarie St approved a large land development at the end of the runway.
The noise argument is getting outdated by the advance in engines. The fact that politicians aren't doing anything is because they are all too scared to lose votes.
What I want to know is why a G-IV is exempt from the Sydney Curfew yet a 717 isn't when they both have the same engine?