I think they're already mostly gone. Driven to death and gone. The newer models will disappear even faster, due to the complexities of maintaining the electronics and sunset on parts availability. They are too road worn and ugly to become treasured classics, too underpowered to be preserved as sexy sports cars, and generally not of interest as road cars after the first 400K miles or so. Gone.

If anything hastens their departure, it will be the incorrigible habit of diesel owners to rip out EGR equipment. If any attention is directed against that, 3/4 of the remaining cars would be scrapped. Try to remember that it's a car, not a political statement.