To me, the picture shows the trade off of prioritizing cars vs walking/biking. You can’t have both.

Fewer cars means fewer lanes are needed. I’ve seen intersections 9 or 10 lanes wide in US cities. How can any senior citizen walk across 9 lanes of traffic, especially at night. One or two lanes is sufficient for all infrastructure like waste removal or emergency services.

But the root of the problem is insufficiently dense living. People have to make a choice to sacrifice their expansive living quarters (such as in Tokyo, Hong Kong, Manhattan, London, etc), otherwise the whole public transit and de-prioritizing motor vehicles doesn’t work.

As I explained in other comments, obviously people do want their space. But is that a luxury they can afford? They’re future generations can afford in terms of infrastructure debt repayments and environmental damage? Health damage from over reliance on cars? I guess we’ll see...but I’m betting not.

There's a lot between what the US has today and eliminating roads. To start, we should have fewer motor vehicle lanes, wider sidewalks, lower speed limits, more protected bike lanes, intersections designed to minimize crossing distance for pedestrians, and centerline hardening for left turns.