The ADS-B thing is a little more complicated (aren't things always that way) I think.
The stuffthey are doing in Alaska uses a package beuilt by UPSAT (the old II Morrow) and allows for radar like atc in a nonradar environment (mountain valleys and such), controlled flight into terrain avoidance and some moving map with weather , I think.
One of the fundamental questions that still has to be answered is what data link to use...there are a bunch floating around, each with engineering pros and cons as well as various political/economic supporters. Until this is sorted out better it will be difficult for the avionics industry to built boxes or systems. Then there is certification. Then there are operational procedures. And only then is there benefits to users.
In the Oceanic airspace what happened to FANS? It is kind of an oceanic ADS B using the ACARS data link.
The Cargo Airlines people could be looking for a "poor man's TCAS" but there also could be benefits in their making schedules for departures and arrivals by increasing the arrival and departure rates at their hub airports. What about section takeoffs?
The ADS-B