I'm pretty sure this debate will go like most discussions prompted by technology advances.
One minor note; it's still illegal to operate drones capable of operating out of line of sight of the operator per FAA rules. I had done research on the topic at one point, and the FAA basically said that yes, while one can launch an uncontrolled "model" rocket capable of reaching 5,000 feet near any airport, it is illegal to launch a remote controlled aircraft capable of reaching 500'. Anywhere. Like, you know, in the middle of a rancher's field miles from any airport.
Anyway, the overiding point has to be that using drones is like using motors or radios or whatever while on the river. If you invade another's space with your technology you risk their wrath, and ultimately the well meaning but all invasive REGULATION or worse, LAW.
That said, if anyone has drone video of hot springs use, or really any voyeur video on the river, well share that s^*t!