Should we start testing UAVs for commercial applications? Yes. Should we allow 13 years old kids to code on them and build their new cool pizza delivery service? Not yet, I think. Just my $0.02.
At the moment, a 13 yr old could fly a radio controlled F-15 legally, so long as it was for recreation and not for commercial usage.
I'm talking, of course, of the 'killer' app - assassination!