When do you think we could have the ground infrastructure of ADS-B covering Europe the way it does in USA today? This is relatively low cost investment and would decrease air space infringements, probably.
Basically, in which direction is Europe heading as far as ADS-B or any other form of Electronic Conspicuity is concerned?
ADS-B out provides ATC with enhanced functionalities. There is no more guessing about "what in the hell is he doing? where is he going?" in ATC's mind.
With 1090 ES, the data sent by the transponder is enhanced and allows for a prediction of the future trajectory. Having the call sign of the aircraft on screen, it is much easier to contact an aircraft.
Across Europe, we have many FIS areas. Most of the ATC guys manning FIS positions will go out of their way to warn an unsuspecting or distrécted VFR flight that he is about to enter restricted airspace. Since radar was allowed to FIS operators, in France, we have seen a significant reduction in airspace infringement. ADS-B out will help in this regard. Also keep in mind that there is some research being conducted to be able to send, within the ADS-B flux, a message sent to a specific aircraft (equivalent to PDLC)