A future with significantly reduced car traffic in cities? It's perfectly possible. Cars will never completely disappear, only someone that hasn't thought about the problem or that is building a straw man would say that.
Car ownership in the US is ~90% (more than one per adult). In The Netherlands it is ~50%. They still have a car per family for longer trips, but they don't need them for every trip, so they use them significantly less.
I would venture that if people actually tried living in a neighborhood that has ample foot traffic access they would love it. You don't need to be in the "city" proper, just a neighborhood with some corner store and a public park nearby. This is not a wild concept to implement at the city planning level at all.
Car ownership in the US is ~90% (more than one per adult). In The Netherlands it is ~50%. They still have a car per family for longer trips, but they don't need them for every trip, so they use them significantly less.