K, but transit takes 4-10 years to build and will still never be able to cover cases like transporting the truly frail and sickly, large amounts of stuff, or going to remote and sparse places, because the last mile edge of the network is still a last mile at minimum, especially in inclement weather.
Cars are still going to exist for the long term forseeable future, we can try and minimize their use by providing better alternatives but we still need to plan for a future where they exist.