It took a while for the suburban model to take hold of the United States, clearly it would take a while to re-densify metropolitan areas. I think you go too far

It took a while for the suburban model to take hold of the United States, clearly it would take a while to re-densify metropolitan areas. I think you go too far by saying it is impossible. To use an Americentric, and worse, SV-centric example, consider when SF's BART was built. They trenched Market Street through almost all of downtown! Building transit even in dense urban areas is clearly doable with enough political will. Maybe I'm doing the typical HN thing and assuming that lots of people are like me, but I've been moving around the SF bay area, and being close to transit is a massive consideration.