I think you'll be fine. Usually 9 is the most you could have in one town. The only way to get a 10th villager is either having a villager from another town moving in yours or if an animal spends the day in the campsite Public Works Project and you ask them to move in with you if you talk to them enough. I do see you have a campsite in your town, so as long as you don't ask the camper to move in, you should be able to have 9 villagers by the time Peanut moves out. So you should be golden.
Negativity is a part of you. It'll always be by your side.