Lucky for us he isn't that popular in the states...., still does good sales and concerts abroad.
Not to sound alarmist, but there is a good chance something like that will happen here, at some event. Hopefully nobody will be injured. I doubt however it will be a "sanctioned" quad/drone flying though, rather it will be someone who wants to get some really beechin footage and thinks they'll be able to handle it, and then poof, down it will go. That reality, and the known exposure is why I don't think you'll ever see that happen here. Hopefully. Although not quite as dynamic, those tethered remote control cameras still get some great footage.