Assessing the potential damage to a jet engine is all good and well. But what about us pilots in the little Cessnas and Pipers? I would really not like to have a drone coming through the front, into the prop or for that matter anywhere on my fragile little bird. This is like "asymmetric warfare". For the "droneys", the risk is small, because the worst thing that can happen to them is that they will have to buy a new one. We may pay with our life. In the end, will we just have to accept the risk or stop flying?
I know this thread is about "commercial a/c", but nothing prevents a small aircraft from being flown commercially.