I figure as long as NY has a port it will survive.
Port of NY/NJ (two states) is 3rd on the list, according to Wikipedia, with the port of S. Louisiana shipping about 3 times the tonnage of NY/NJ. After hearing about the hard times NYC has fallen on, I'm afraid tonnage fall even lower?
https://en.wikipedia.org/wiki/List_of_ports_in_the_United_States