The "admission" was that JFK was important to big corporate accounts that fly a lot across the network. So, if they lost $10M a year on JFK, but those accounts contributed $100M overall profit across the network, they lost $90M getting out and losing those account.
At this point they probably have to sleep in the bed they've made, since going back to JFK means buying slots, getting real estate , building a polaris lounge, etc.