Cars are by now a hard to reverse environmental and urban planning disaster across the world. We are stuck with them. As a mode of transport it has grown uncontrollably at the expense of all others (except the airplane) and practically everything has been shaped to accomodate it.
Reversing that development, limiting car traffic to where its really needed is like trying to perform a complete heart and arteries transplant on a living person. Even if there was a will (which there is not) it is not clear if there is a way.
In the best scenario it will be an excruciatingly long transformation (~50 yr) as car oriented cities (or city sections) get slowly deprecated and the car-free or car-lite segments become more desirable, more livable.
What utility do cars provide?
Do zealots even consider these basic questions?
Horses
> What utility do cars provide?
They don't shit on the street.
Until 1976 the law was still extant that they had to keep a bale of hay in the vehicle.
The prices were even regulated
http://www.londonancestor.com/stow/stow-hack.htm
Indeed the Romans even had regulations about road width to ensure drawn carts could pass each other
> he could have ridden the Tube.
But he took a carriage more often than not.