And this is why I fear that parts suppliers like HK are going to end up on a hit list eventually.
Trying to regulate radio controlled models is going to be about as hard as regulating any other dirt cheap consumer technology. For the regulation to be effective, it's going to have to be extremely heavy-handed. Then we'll end up in an endless cat-and-mouse game of workarounds.
2-5 years from now your HobbyKing multirotor controller board will be sold as a generic robotics gyrostabilizer board, with no mention of flight. It will also be delivered without firmware. You'll have to find an illegal overseas torrent of the firmware file you need, and you'll have to flash it yourself. At this point you'll have committed multiple felonies, like every other person at your hobbyist flying field, but since "they" only go after the biggest offenders (and people that they need to charge with something), you'll probably be fine. Probably.
Except once in a while, you won't be fine, because the eye of Sauron will turn to you. Then we'll get a news story about an "unjust" drone bust and it'll be discussed here.
"14 Year Old Inventor Builds Unregistered Drone, Arrested by FBI"
This story will happen when a kid does the exact same stuff that every other hobbyist does, but he flies his technically illegal drone too close to someone fussy. So maybe the kid's drone scares someone's show horse in their yard, and the horse owner calls the FBI, and then the kid gets jammed up, and we talk about it here and hope it won't happen to us.