Supply and demand.
Importing too many Muslims. Not enough Catholics reproducing.
They could have kept these churches open. I know people in some of these parishes and they had raised the money for repairs and running expenses and wanted to evangelize in their areas (either blacks or the unchurched young whites or Hispanics moving in). The archdiocese just didn’t want to, because Dolan wants to sell the property and he wants the number of parishes on NYC reduced to ONE THIRD of what they were when he took over.
Dolan and his boss are both creepily smiling, evil statists who don’t give a darn about the Faith or about the flock. Unless they happen to be LGTBQWXYZ.