They're not implanting it against your will. You had to agree to it. Involuntary implants would be a completely different story.
Just like seatbelts where voluntary, and credit cards where voluntary.
Now, in most states you will get a ticket if you don't have your seatbelt on, and good luck renting a car or hotel room if you don't have a credit card.
This is how it starts, voluntary, fun thing to do.
Then you job will require you to get an implant, if you want to keep your job.
Then the state will require it if you want to fly, buy a gun, or drive a car.
Eventually you won't be able to buy anything or go anywhere without a chip to identify yourself. And the government will have scanner setup everywhere to track your every movement.
Might make it easier to solve crimes, assuming the criminals are not smart enough to block the chips signal so they are not tracked.