Bill, you may be correct today but I don't think your correct to assume the same of the future. I'm a farmer, won't be that long before we're using small UAV's for detailed crop imagery. unanimous, ie:no human intervention, means these aircraft wont see and avoid you if you don't broadcast your position, no problem for us, we'll just get the airspace over the farm declared a danger area. enter at your own risk!
Next time your flying over arable farmland just take note of how many crops are planted,sprayed & harvested in perfectly straight lines, we do it for one reason only, efficiency. 10 years ago this was nearly unheard of, today its nearly impossible to purchase farm equipment that's not setup for precision agriculture, my point is farmers are very quick to embrace technology as it becomes available, use of UAV's are the next logical step in precision farming. All those farms are likely to become your safety problem or restricted airspace, take your pick!
Andrew