According to Mike Schur's interview with Alan Sepinwall, they knew they were getting one more season before they decided to do the reboot. I, for one, am glad that we won't be seeing Leslie & Ben struggle with a high risk pregnancy, dirty diapers, or middle of the night feedings. And apparently, the citizens of Pawnee are being pushed to the background next season. I guess we'll just have to wait and see what the new show looks like.