> I don't think we could go down to zero cars any time soon

Of course I have no idea the specifics of where you live, but I think many suburbs could make this possible within 5-10 years by:

-zoning an area to be the suburb's "downtown", i.e. a few blocks of small apartment buildings with ground floor retail including a grocery store and restaurants

-building high-quality bike lanes to get to the new downtown

-subsidizing a service like car2go to make it easy to access cars on-demand when you need to go somewhere farther

In any existing suburb, you won't get widespread purchase and demolition of existing buildings, rebuilding in a new footprint, and occupancy by businesses in a 10-year timeframe.

That's just not true at all. With the current nationwide housing shortage and sky-high rents, developers will jump on any opportunity immediately. All you need to do is set the right zoning code and streamline the approval process.

Check out this tweet series for many examples: https://twitter.com/search?q=turns%20into%20(from%3Amnolangr...

That tweet series shows a bunch of individual parcels developed over a typically 6-11 year timeframe. That's necessary, but not sufficient, to generate an entirely "new downtown" widespread redevelopment all happening simultaneously over a 10-year timeframe.

> over a typically 6-11 year timeframe

The dates there are just when the street view photos were taken. All of those smaller apartment buildings can be built in under a year, and 1-3 years for a highrise.