Drones are damn hard to see....but then so are Birds
At least some of the birds have some semblance of self preservation built in. Birds have sensors - sight and sound. Birds are an increased risk to modern quiet machines. Ask an EC 135 pilot. Drones - not so much.
TCAS requirement for drones anyone? Cant be that hard - they got this far and apparently they are very smart depending on who you talk to.
They are cheaper, more efficient and have already started elbowing out helicopters.
And also dangerous and invasive. If they want to hang with the big dogs they need to be a lot smarter. Let them do the adapting.
Probably won't happen until there is a "major" which is only a matter of time.