The backbone: a bullet train. You could live in downtown Baltimore and work in Manhattan and not even think about the commute.
JFK to Penn Station and Newark to Penn Station: short distance bullet trains. To get you there in minutes.
Dedicated Caribbean organic farming to feed the Megacity. I don't know about you but I like mangoes.
100% electric vehicles in the territory. By law.
A next generation industrialization in the entire Eastern half of the US that is 100% feeding on Clean Energy.
WiFi in every inch of the territory through the TV spectrum. Free. Telecommuting should be the norm in the workplace, partially or fully.
The NYC Subway will have to be reimagined. Levitate it. Extend it. WiFi 100% everywhere. People will be having business meetings in there. No coffee though.