“I do wonder how well forcing people who already own their cars to install the device would go over.”
Oh, don’t worry about this. They will make an older car not so equipped impossible to license. And our idiotic pollution testing goes on here all the time with nary a grumble...
Ya, I thought about that, except that the Fed does not handle licensing the cars. States do. And while some will go along with it, I doubt all will.