Probably unnecessary. NYC's letter was not accepted:.
NYSRPA filed a response to the "letter" asking the court to moot the case.
http://www.supremecourt.gov/DocketPDF/18/18-280/107394/20190708151746089_2019-7-8 NYSRPA response letter.pdf
Letter dated July 3, 2019 of City of New York, et al. not accepted for filing. (July 08, 2019)