This is closer to banning moonshine which was arguably fairly effective.
> not be a plant of any value what so ever
It’s long been a perfectly viable strategy to plant pot on public lands and then come back for harvest. That doesn’t mean people are tossing seeds randomly, but lower rewards are balanced by lower risks. Some customers are always interested in savings cash even for a terrible product.
That said, I think enforcement would be more effective for drones. Marijuana can be effectively enjoyed in the privacy of your own home, but that's only true for a limited extent of drones. They're noisy and usually flown out in the open where annoyed neighbors can narc on you. Furthermore, just my subjective guess, I think people will be more willing to break the rules to enjoy marijuana than to enjoy drones. Marijuana is very effective at making a shit life tolerable, so people are more willing to break the law for it (and alcohol, etc).
And it'll be the same here in this context. If the government wants to make drones illegal because people are using them domestically for vigilante/terrorism purposes that'll be quite difficult.
People regularly ran clandestine grow operations that used 100kw+ of power for years and were never caught. If there's a desire for drones to commit crimes than someone will easily be able to make a clandestine drone factory.
But I think that the cat is out of the bag and that DRM will be the attempted solution to this kind stuff. It's going to go poorly though.
What part can you regulate and control? Not the batteries or the motors, or the off the shelf microcontrollers.