Frankly, you're mis-understanding the technology they're talking about.
When you say the words "tracking device", people can't help but think of Orson Welles and Big Brother, but an RFID chip isn't what I'd call a "tracking device".
These chips are NOT something that can be located at random, as in a GPS transmitter. RFID chips are essentially a digital serial number, nothing more.
The article claims they could be re-written to include new information, reflecting sales or transfers, but personally, there's no reason any shooter would REQUEST that info be programmed into the chip, nor would they take the time to RE-WRITE the chip upon a private sale... And beyond that, there is no system in place to REQUIRE a shooter to perform those steps.
Frankly, I think it's a neat idea. Not really as functional as it might seem, since they'd be removeable, or erasable (strong electromagnetic field will "kill" an RFID chip's memory), but it would at least take more than a file to erase a serial number off a gun.
It ain't a great plan, and it'll fizzle out quickly, but don't worry, "big brother" aint watching you through your Chiappa 1911...