Well, according to wikipedia, only between 11-15% of bird strikes result in damage to the aircraft. Apparently large birds like geese are the main danger.
I imagine a similar distribution with drone strikes, as most drones do not weigh as much as a goose, at least of those in the hands of a typical idiot (who would fly in the path of a plane).
That's why 'very high fatality chance' doesn't seem right to me, but I can't find any statistics on it.
