Am I reading the map wrong or does the article just have a misleadingly alarmist headline? Sounds like it's a few blocks on the edges of the neighbourhood being rezoned - all of which look to have some easily developable land - not anything close to the entirety of Soho & Noho:
https://goo.gl/maps/u9SjkXu42yGtCuUA7
https://goo.gl/maps/meX4yV68VryL3JEG9
https://goo.gl/maps/HMBx32mD5ZNssvgcA