Tourist is spot on here.
Its still easily doable, and you can confine the GPS spoofing to a small area if needed. You could possibly even target drones with a jamming signal/spoof signal with directional aerials,
problems
1. Hand flying a drone, without GPS, using iether video googles or eye site and aiming at a target is extremely hard, ( multiple variables get in the way )
2. Weight/power of rc drones/planes has some serious limitations
probably good ideas to implement
1. Licences for any airfraim/motor combination that can fly more than 100 meters from the user ( like a CBT for the air )
2. Blanket bans around airfields for 10 miles without permission from control tower
3. battery capacity/power to weight limits ( there is already weight limits, these need to be combined with power limits )
Number 3 and 2, would stop all accidental occurrences,
i made/built a full gps/waypoint Rc plane with autopilot and trimmings ( telemetry and video ) between 2006-2009 , before you could buy them on the hobby market.