Fact is that UAVs are going to play a significant role in global aviation in the future, like them, hate them or anything in between. - they are hear to stay with their applications expected to grow expediently over the next decade. Forgot the pilotless pax aircraft, that’s a totally different concept.
As far as shooting them down and stealing the payload, whilst that’s plausible and possible, stop dreaming people, it’s no different from using a mail delivery van, UAVs will be just another method to transport cargo. Don’t see to many delivery vans getting held up or shot at.
DJI have just released the Mavic 2 Enterprise which is ADS-B in equiped, pretty impressive for a sub 2kg drone.