The cure
To stop the hysteria ALL flying drones over 500g (a crow's weight) should have a mandatory baro sensor which prevents them to climb more than 400ft over start position . It's cheap ,5$ or so at the source , light (a couple of grams ) and has about 3-6 feet acuracy .I know what i'm saying it can be done cheaply .I would even mount them in triplicate in larger drones to guard against failure .DJI should take notice.