Robin
Surely not hitting another aircraft in flight is a big advantage, ADS-B will atleast keep the bigger and faster aircraft away from you.
Most of you have a GPS ADS-B works by broardcasting your position (from your GPS) via the Mode S transponder. An aircraft equiped with the full system will get commands to avoid your aircraft in much the same way as with TCAS.
As the cost of the system comes down I see a larger number of aircraft fitted with the system, after all in 1980 who would have predicted that in twenty years most light aircraft would have a global area navigation system.
But we need to push Eurocontrol and the CAA in the right direction and that is why I support ( with money) the efforts of the PFA & AOPA (IO-540 I would support the PPL/IR lot but I can't because I don't have a PPL)