The receivers would enable drones to sense manned aircraft and automatically avoid them.
Er, not all manned aircraft have ADS-B. Isn't that so?
And if that was the means by which drones and aircraft were going to safely share the same airspace, doesn't that mean that ADS-B (and everything behind it, such as the GPS, etc) then becomes safety critical equipment? And doesn't that then mean that jamming GPS becomes a good way of creating dangerous airspace?
I think there would have to be more to it than "just" ADS-B.