So, its happened here... Albeit a happy outcome it does hint at things to come - this happened at 2000 feet with an unknown, so far unidentified drone.
The article is in norwegian, but the gist of it is that the collision happened in the southern parts of Norway this week to a foreign single-engine airplane receiving the hit with the landing gear.
Fortunately no real damage done, but there is a lot of focus being drawn towards the problem of course - and I would guess that there is a pretty active investigation running!
Luftfartstilsynet frykter alvorlige ulykker - Luftfart - VG
So far 18 reports on accidents have been registered this year here, and around 20.000 drones are probably sold.
Today I will be sending my own operation manual for review, its taken half a year - and there are still some aspects of operating the drone I am using that I will have to make sure will not be a problem. But climbing to 2000 feet? No way, never!