Nah. With the right reforms, we could make cities walkable in a decade.
Land value tax
Carbon tax
End single use zoning and upzone everything
End parking minimums and free public parking
Streamline building permits
More in-the-weeds zoning reform, like removing minimum lot sizes, removing setbacks, removing aesthetic constraints, etc
Defacto policy of not removing privately installed speed bumps that people make in front of their houses
Of course, good infrastructure and transit would be nice, too. But these reforms would cost very little money and could be implemented immediately, and would likely result in a city overrun with chaotic, uncontrollable ebike traffic - which I'm okay with.