Deadline reports that previous seasons of CW series that premiered throughout the 2018-2019 TV season will continue streaming on Netflix during their runs on the network and for an unspecified number of years following their finales.
The expiration of the 2016 deal this spring means that new shows from The CW will not automatically begin streaming on Netflix following the conclusion of their seasons.
So, Netflix won’t necessarily lose all of Arrow once it ends next season.