They also need to give shows some kind of ending even if they are not part of their long term plans. Having a library of shows without ending is not attractive to customers.
AppleTV has been running circles around Netflix (and other streaming services when it comes to quality), what is the last critically acclaimed series on Netflix? I am not saying that your shows need to be critically acclaimed but you can't be in a state where your shows are getting panned criticlaly and on top of that not giving endings to your semi popular shows.