With any luck, over time, we'll learn proper city building infrastructure from the europeans and implement it locally. Florida will probably be several feet under the ocean at that point, but hopefully when everyone relocates to higher ground we'll build half decent cities for them to live and work in.
Honestly Japanese city infrastructure and planning is better than the european one, so americans should learn from Japan in that regard not europe.
Especially integrating train stations with shopping malls.
Make train companies real profitable by making the stations profitable by integrating them with businesses like hotel chains supermarkets and more using the location to their advantage
Parking in your own garage or Parking House required, no curb side parking making roads smaller more unobstructed improving visibilty and safer.