I actually would support this if it was part of an honest effort to improve transportation and livability in the city, but most of these proposals make it harder to live here, not easier. I suspect the real motivation is a mix of environmentalism (cars contribute to global warming) and classicism (only the rich drive cars in NYC).
NYC politicians should be focused on how to move the most amount of people, the safest and quickest way, for the cheapest cost. If they want to ban cars due to effects on the environment, they should say that maybe promote electric vehicles. If they want to tax the rich, they can simply impose a more progressive income tax structure.
The current muddled response is actually making transportation in the city more expensive, often causes more emissions due to longer rides, and has an insignificant effect on the rich while hitting the pocket-books of everyone else much harder.