I always have felt like blaming cars, of all things, misses the bigger picture. 1 crude oil shipping vessel produces more pollution than the entirety of cars in America will for a year. Cars are one of the things that actually empowers individuals to live their individualized lives. Hell, some people live in their cars/rv/campers and it allows people to escape the rigors of daily life.
I agree we should take aim at making them more environmentally friendly, and take a harder focus on replacing plastic components with metal and/or other recyclable alternatives. If we could sequester carbon into them somehow that would be even better; but things like carbon fiber require nasty epoxies that are difficult to break down again once they need to be recycled.