Do you have a source on few Manhattanites using public transit? Given the high numbers of car free households, that would seem counterintuitive.
Mike Zumwalt said:
Manhattan is so dense and unaffordable that most people who live there don't bike or use mass transit they cab it or have a chauffeur.
If you live outside of the city you have to take a train or carpool with a minimum of 3 people+ no way to get in by bike from Jersey or Connecticut.
Over 22 million people live in the metro area and if you don't want to bike I don't see any change happening soon, beside lower Manhattan is below sea level anyway and built on a literal garbage dump so any future storms will affect it the same way and biking through 4 feet of water is not something most people will do.
Of all people who commute to work in New York City, 41% use the subway, 24% drive alone, 12% take the bus, 10% walk to work, 2% travel by commuter rail, 5% carpool, 1% use a taxi, 0.6% ride their bicycle to work, and 0.2% travel by ferry. 54% of households in New York City do not own a car, and rely on public transportation.