Kind of similar to New Leaf villagers don't often come to the campsite unfortunately, and since this game has autosave we can't use the campsite reset trick anymore..
You can actually still get a campsite visitor even if you have 10 villagers. While I was time traveling to move my 10th villager out, Isabelle told me that I had a visitor at the campsite. I was pretty surprised since I was TTing for a while but I can happen, just really rare. On another note, I read from someone that non-amiibo visitors can still kick out a villager if you ask them to move in. It's a great update but not 100% if it truly works
I’m surprised (and a bit annoyed) that it happens so rarely again. It would have been nice to be exposed to new villagers regularly.
What makes it all the more frustrating is that the timing of campers and open slots in town has such a low chance of overlapping.