What also should be added to the mix is that the technology exists to completely rewrite arrival and final approach paths. These should incorporate RNAV and GBAS capability to spread the arrival noise over a much wider area.
Ah but then we come up against another of the ironies of this industry - that it is much less controversial to put more noise over people who are already used to it than a little bit of noise over people who didn't have any before - that's why any attempts to change flight paths become so emotive.