Beside the elegance and historical significance of airships, I don't get the advantage compared to a quad drone. If multiple cameras are needed, why not launch multiple drones? Simply tell the drones to platoon with the leader.
Basically, the airship drone has more payload, more range of inspections, and less risks to fly (more visible for other users of the aerial area, and falls slowly to the ground in case of engine malfunction).
I'm guessing that a hydrogen airship can cover a significantly larger area with less power than a drone.
You can probably do multi-day flights with these things.
Energy usage is far less with an airship
The opposite is true. I would claim that even 100 drones would use less energy than one airship.