If NYC was still an important place, someone would have mentioned it already. Yet they haven't.
The trade routes of the east coast go as far south as North Carolina, as far north as Massachusetts, and as far west as Ronto and the Pitt, and no one in D.C., or The Pitt, mentioned NYC at all.
-Both Tobar and Quinn, long-time traders who have gone all up and down the east coast don't mention it.
-Ashur, the ruler of The Pitt, compares his city to the likes of D.C., Boston, and Ronto, yet makes no mention of NYC.
-The scientist Zimmer, who would have had to walk right past NYC on his trip from Boston to D.C., doesn't say a word about it.
-Marcella, the missionary from The Abbey of the Road, which is likely in New York state based on its location description, speaks of rumor from The Pitt, and going to The Commonwealth, and D.C., on her terminal, but makes no mention of what was the most famous city in her home territory.
NYC, if it still exists, has apparently been reduced down to something like Philly, which was called "in ruins", and "that dump" by at least one person from D.C., and given how bad D.C. was, thats paiting a pretty empty picture.