I say this as a local who has gotten into countless arguments with friends and family on the subject. I probably believed it as well a few lifetimes ago before I moved to NYC for 13 years and have since been completely converted.
It would require an enormous investment in public transportation and real bike lanes - I mean protected bike lanes like they're doing in NYC, not two faded white arrows in the rightmost lane - and then a generational shift where we convince the younger generations that car-ownership is overrated, wasteful, and terrible for the local economy.
But Americans care too much about comfort and convenience to do that. SUVs rule here.
You would then want to drive as far as you can, park, and take the alternative in.
It's made for people that don't live walking distance from a train/bus line, but also don't want to deal with the traffic/cost/overall hassle of going by car end-to-end.
There are 80 Park‑n‑Rides throughout the my metro area.