The consensus in this thread seems to be that the only alternative to the current noise situation is to close the airport. Yeah the airport is not going anywhere, but relative to noise abatement procedures at major airports elsewhere in the world, Calgary does very little. These 2 people filing thousands of complaints won't be the deal breaker, but enough people with enough money can complain and can make a huge difference on flight operations. See John Wayne Airport in Santa Ana, California:
In Calgary, the downwind in south flow could be moved further west, eliminating noise for the far NW as planes prepare to turn in over Airdrie to land southbound. Specialized departure procedures like at John Wayne get planes higher sooner so they can throttle back and cut noise nearly in half. Elsewhere in the US, planes follow GPS tracks after takeoff to avoid the most noise sensitive areas; that could be done in Calgary and also for arrivals so they wouldn't have to overfly Airdrie. Banning reverse thrust and APU usage on the ground would make a big difference. The loudest offenders, 737-200's, etc., could be banned. Until their hand is forced, none of these more aggressive noise abatement tactics will be undertaken by YYC, but again... it's not "all or nothing".