I live in the suburbs of a HCOL city in the US. My wife and I could absolutely afford two cars. We have one. I don't think we could go down to zero cars any time soon, but the transition to one car was a lot easier than we thought it would be.
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
Check out this tweet series for many examples: https://twitter.com/search?q=turns%20into%20(from%3Amnolangr...
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.