It is really comical how some people think NYC wont be bigger than it was pre-covid. Been here for decades and the people that have "left" by and large moved to the suburbs. Minimal exceptions actually moved out to states NOT named New Jersey or Connecticut. There are countless recent college grads and many more coming that cannot wait for the opportunity to work in NYC. Traffic is nearly back to pre-covid levels and manhattan is already bustling with the weather getting better. Once everything is fully open it will be as congested as ever.
Delta's presence in NY will be bigger than it ever has. JFK and EWR will be redone a la LGA over the next 5-10 years with more gate space as well.