Queens and Brooklyn will continue to drive those residential numbers. That's really where a bulk of the housing should go. Same with the Bronx. Issue will naturally be school capacity and transit and so more frequent service, additional trains will be needed.
They also should, although big opposition knowing those folks... consider Staten Island. There is a ton of potential for that borough. Its the most underdeveloped one at the moment. And land galore. Will come with its challenges transit wise but if they put the thinking hats on, they can make something work. Ferry galore.
The city has the land, they just need to think big. Red Hook as an example.
Sunnyside Yards also but that will take decades.
They really need to reduce the time for things, that's massive. Sunnyside Yards should be happening now, not 20 years from now.