Good idea/Bad idea
On the one hand, I can certainly see where this is needed - especially for units large/powerful enough to interfere with other aircraft.
On the other hand, this statement: "The DoT noted that the requirement for registration will not be all-inclusive. Toys and smaller drones that don't fly at a high enough altitude to interfere with other aircraft would be exempted from the registration rules. " This is a bad idea because many complaints are from "regular citizens" who don't like nosy neighbor's expensive toys which are perceived to be spying/ogling them and/or their children. And such citizens would, apparently, need to continue taking care of the matter themselves because these smaller/less powerful models would be exempted from regulation.
My biggest problem with this is, over on this side of the Atlantic, government regulation usually starts out with the best of intentions but inevitably gets wrong way round in implementation, bogged down in details, etc. My worry is that, as is often the case, the wrong people will end up on the losing end of this.