How would you deal with all sorts of emergencies involving human pilots? For unmanned aircraft(aka drones) it’s a lot easier to implement unmanned traffic management (UTM).
Direct them to land in the best location and make sure all other aircraft are on non-intersecting flight paths. What exactly is ATC doing that software isn't able to?
How many options are there for handling emergencies with aircraft now? You pretty much just have either land ASAP or circle to burn fuel and then land.
