In the Top 10 US cities that have the density to support this, sure. Head out to the Top 100s and this reality falls apart very quickly. There's no economic incentive for businesses to be so well distributed through a dense urban core. There's differential zoning and mixed use that form the backbone of those cities economies.
The idea that we can just total re-engineer our cities and our social lives all across the country to solve a traffic problem that is not at all distributed the same way is insane to me.
Most deaths happen at night. Most deaths involve alcohol or drugs. Other common factors are speed, youth, and bad roadway configuration. A tree in the wrong place is lethal. Bad guardrail installations are lethal.
There is so much more to do than to put everyone on a bus and pretend that 15 minute cities are going to work.