I'm not sure where you live, but I've lived in a few states in midwest and eastern US and have never had to register a gun. It's probably a matter of different perspectives, but I view such requirements as a gross violation of privacy and a potential safety threat as well - and wouldn't consider obeying such a law if one were to go into effect where I live (or if I moved into such a jurisdiction).
If you ask me, drone registration is a faux-solution in search of a legitimate problem to address. I'm not aware of a single airplane that has crashed or a single plane full of passengers that have died as a result of somebody operating a drone. Instead of searching for maybe-someday problems to address, our government should be searching for ways to more effectively spend our money. This just tells me that the DOT, FAA, and other such organizations are grossly over-funded and over-staffed, and desperately need to be put through a reduction in force exercise.
I, for one, see a whole slew of issues with drone registration - and am steadfastly opposed to it. This creates a whole bureaucracy and wastes millions more taxpayer dollars. At its most benign, this forced registration scheme unnecessarily invades privacy - and at worst, invades personal liberties. At present I'm not entirely sure that I have any plans to comply.
This creates a whole slew of questions and potential problems as well. How do they intend to ensure compliance? Do they intend to force hobby shops to carry an undue burden of registering the drone at the point of sale? If so, how do they intend to deal with people who walk in to a hobby and pay all cash for the equipment, then register with a false name and address? Or will they place a further burden and invasion of privacy by requiring an identification to be validated as well? Will they require some sort of operators license or certificate to purchase? If so, how do they intend to combat people who just use a counterfeit certificate? (I'd be willing to bet that a number of hobbyists would consider the old "Photoshop it" approach if getting the certificate required a significant investment of time or money.)
How do they intend to deal with person-to-person purchases through eBay, CraigsList, and the like? If I decide to sell a drone to somebody on one of those sources (or similar), I'm sure as heck not going to do the government's job and register the sale. Heck, there are plenty of things that are significantly more "dangerous" today (like firearms) that go through private transactions with no requirement to report the sale to any government agency.
Perhaps this will help increase drone sales from shops in Canada or overseas? If US residents are forced to register domestic purchases, I can see some (myself included) who would turn to international purchases. It would be worth it to pay the extra shipping and transaction charges to avoid undue government interference and oversight. Heck, this might even give rise to some sort of "black market" domestically for unregistered drones.
At the end of the day, this requirement is silly and makes us not one single iota safer as a society. As such it is a bad policy that will hopefully be attacked in the courts and declared invalid soon thereafter.