I think you may be underestimating the degree of tribalism other cultures have, overestimating the resiliency of our economic system + resources, and are not cynical enough of the people who purport to represent us/the government’s ability to effectively manage such a process. There are few things in this life I despise more than traffic, 1 billion Americans would make that much worse. Opting for extremes in anything is usually terrible policy imo