When will the Canadian ADS-B satellite system be implemented? It is interesting that ADS-B is not mandated in Canada as of yet. If you fly in the US you quickly realize the benefits. Now as I understand it Nav Canada is the largest shareholder in Iridum but ADS-B in the SDA (Southern Domestic Airspace) is still far off.

Some people may hate the idea of a mandate but I fly in the south and it is crucial to be able to see other traffic. XM is great for WX but expensive. I am curious as to why Nav-can is not hot on the ADS-B trail other than the politics of mandated dollars for Mode-S transponders.

Does anyone know the timing for implementation of the ADS-B satellite system for Canada?
This Advisory Circular, although from 2011, is still current and indicates that there will no Transport Canada ADSB mandate (being regulatory, it's not up to Nav Canada).  It appears the policy is to foster voluntary adoption of ADSB over time, and Nav Canada will create an environment where aircraft operators will get operational benefits by adopting it.  

So the commercial world will likely switch over fairly quickly, while GA operators and private owners will do it gradually as the costs of the systems come down, and anyone who doesn't want to doesn't have to, and can continue using Mode C. I imagine that later on, when the system is mature, say in 5+ years from now, and GA ADSB systems are dirt cheap, TC/Nav Can will likely decide it's time to phase out surveillance radar completely, and then it'll be mandated for anyone that wants to operate in transponder airspace.