Bing
If you read this thread you should have no difficulty comprehending that the world of reality is not just Oz. In fact, this thread disproves reality at times.
UAV ADS-B - I have no thoughts other than safety.
If you are going to have someday UAV buzzing around at low levels cropdusting, taking estate agents aerial fotos, doing survey work, etc it is a given that see and be seen will not work - therefore it follows that if they have ADS-B OUT and IN and you likewise - there is every possibility you will not make your way to whatever number of virgins await the faithful
james michael, I will accept your round-about answer as a yes - that UAVs will need ADS-B before to many more come on line
Maybe other ways to do it though. Heres an older paper (of interest to me re the authers)
http://eprints.qut.edu.au/archive/00002862/01/2862.pdf