I'm gonna think a bit outside of the box, here. There is still a bit of speculation/confusion as to what the new rulings actually entail, and how we, as fliers, and the manufacturers need to address them.
Evidently, it would be impossible for the FAA (or whomever) to keep real-time data on each and every drone in the country simultaneously, especially if they relied on internet connectivity to accomplish it. Internet connections are not available in the majority of rural areas where a lot of pilots enjoy flying and photographing nature or events.
With that being said, it would seem that the FAA/gov/etc. are interested more in identifying infractions as they occur, or shortly thereafter. That is where an RFID type of tracking would be most beneficial to them.
Most, if not all, commercially available drone systems on the market today are equipped with WiFi transmit/receive radios. WiFi, although technically a short-range radio link, is extremely effective in line-of-sight situations. It would seem that a simple firmware modification that sends a packet of identification data via WiFi at specified intervals would allow an observer (within range, of course) to positively ID the aircraft in question, and take whatever action necessary.
Please keep in mind that I'm not an expert, by any means. I'm a licensed Amateur Radio operator (over 50 years) with a fairly good understanding of RF fundamentals, and a self-taught, self-described "computer geek"! I just think that there should be a fairly simple solution, if we're persistent enough to find it.
Enough for tonight...
Happy New Year!