While urban lifestyles are becoming more fashionable in the US, growth is higher in the suburbs[1]. Whether this is because suburbs are the only option for people moving to new cities (as urban cores become "full"), or because Americans (including millennials) are much more comfortable with suburban lifestyles than they are given credit for is up for debate. But to speak as if a sharp turn towards public transit based cityscapes is America's fait accompli betrays a serious lack of understanding of the country and it's people as they currently are.
[1]https://www.brookings.edu/blog/the-avenue/2019/05/24/big-cit...