80% of the US lives in metropolitan and micropolitan areas. Most people work in the same metro or micropolitan area that they live in.

Biking will never work for every trip for everyone. Public transit will never work for every trip. But it's something that can work for many more trips, given better zoning & infrastructure. If you're in a town, city or suburb, you shouldn't need a car to buy milk or have a pint with friends.

Getting most people out of cars is good for everyone. Cars lanes have much, much lower throughput than bus lanes or bike lanes do. Think about how much nicer driving is if you're not stuck in traffic.