I think they should treat each incident as it happens instead of banning everything. It's ridiculous now as soon as something new and fun comes out the government is ready to ban it. They don't like people having fun or doing anything different/new. If that same methodology was used back when the car was invented, they'd have ban cars a long time ago. More people die in car accidents than there are drone related incidents or incidents with any other thing that has been banned.
A drone could maybe take down an aircraft but that would require some serious skill, and someone who actually is trying to take down an aircraft is probably going to use rockets or something. Or lasers. Either way to take down an aircraft with a drone you'd probably need some kind of heat seeking tech, not to mention very good speed. I imagine it would be very hard to control it at that altitude as it would be hard to get a good visual on it's exact position. FPV would probably not work that high up. (not sure what the range is, maybe I'm wrong) If someone tries that, punish that person for attempted murder or something, don't ban the whole hobby or make ridiculous restrictions.