Plus, few people can afford it. Have you looked at the price of a parking spot in e.g., major parts of Boston or NYC? 5-6 figures to buy, or hundreds/mo to rent, and that's with working mass transit. I guess that those prices would at least triple if everyone started driving. Lots of wealthy people take the subway and commuter rail.
I don't think cycling is the solution. But cars are definitely a non-starter.
Own a car in NYC. $400 for the lease. $200 for insurance. $400 for parking.... or about $200 every 2 months in parking violation tickets.
But... Even in NYC a car is the difference between going to one of the packed urban parks... vs going to the woods upstate.
Bikes on the other hand scale much better. You can easily double a road's throughput with bikes. Now take away lanes used for parking and even more bikes fit on the road.
For often jammed inner city street, I think its more an order of magnitude increase or more rather than a double.
Bicycles (or other small wheeled vehicles) are much more accessible to more people now that electric power is practical in addition to human power.
In many urban areas, there is a lack of _any_ safe bike routes from point a to point b, which is not the experience of the motorist.
There is no way cars are the solution to this.
I couldn't find a parking spot in Palo Alto, CA... and that's not a densly populated area.
On the other hand people could wear a full face mask with good screw on filters too.