I am kidding..maybe.
In all honestly, I think the time for US to create large scale construction projects that serve humanity (at the expense of environment) are over. We are lucky that the interstates got build in 1950s, that the NYC Subway was formed in late 19th century etc. Today, the regulations and outrage is so strong that none of these would have been possible.
It is good to see other countries such as China being on the cutting edge to see what is possible.