A different, but very related topic was/is the idea that drones would revolutionize aerial operations (like ag/spraying, surveying, etc.) I've done a bit of work for a major aerospace company essentially "auditing" studies done to look at drones in these roles - and every single one of them was fraught with assumptions that favored drone operations (and deviated from the real world) and penalized manned operations After adjusting for these, the drone ops almost always "lost" the cost-effectiveness comparison with manned ops.