My apologies I didnt mean to put words in your mouth. However, your premise is flawed, the health of cities doesnt hing on "attracting suburbanites". Plenty of studies have shown tax revenues generated in the urban center are what subsidize suburban life and infrastructure, not the other way around. Suburbs are by and large financially insolvent, dependent on debt financing and continuous expansion to pay for their own infrastructure.

Downtown businesses also routinely overestimate how much out of town car-travel custom they get, they're mostly running on foot traffic and local demand.

Also, the notion that suburbanites have to take cars to use urban amenities is just wrong, plenty of cities around the world in Asia and Europe do fine with high quality frequent rail service. Its not a pipe dream at all, it is in fact exactly the kind of infrastructure we had in the US for the first half of the 20th century.

Edited to add - saw something on another subreddit that nicely sums up my argument in re: infrastructure. We dont need to bulldoze more of our cities for the sake of the car: https://www.reddit.com/r/bikecommuting/comments/11ncpvp/a_city_designed_around_driving_doesnt_work_for/