I've had a free space in my town for weeks now. I've Streetpassed a couple people and went online many times but the space won't fill. I'm kinda glad because I don't want a random villager moving in, but I've gotten almost no villagers in my campsite. I've been doing the new-character trick so it's technically been generating that stuff twice each day and even then the campsite is always empty. What's the point of the campsite when it's empty the majority of the time?
To make you mad when you get somebody good after you do end up being full.