>I'm curious what this will do to the used car market in 10-15 years.
Depends on LEO. If it is easier to deal with trackable cars, then untrackable cars will be hotter than black tinted windows and radar detectors.
It already is, to some extent; why can I not gut my catalytic converter & change some programming so my car says the outputs are fine? Because the state wants me to get rid of my old functional car to support the economy of newer more expensive vehicles.