This seems to ignore that we've been thinking of the cars for a century and it really hasn't worked out all that well for cities, where most people live.

We need to do it differently, and more cars/space for cars isn't the solution. It doesn't need to be bikes either; plenty of people can't even ride bikes. All access lanes seem be the best solution I've seen (wide enough for mobility scooters, room for passing, on and off ramps, etc).