I miss having 15 still. Although now that we have PWPs and can build our houses anywhere we like I agree more than 10 wouldn't fit. The town would need to be bigger, but I would have no problem with that.
10 is perfectly fine for me, but yes, I feel like more would make the town a bit more lively whenever they're all walking around.
What they should do for the next Animal Crossing is have it so you could set/limit the amount of villagers you want to a maximum amount of like 15! That would be pretty sweet.
Or they could have different sized map layouts with a certain max number of villagers based on the size of the map. Some people would like smaller maps, some people bigger, and some inbetween with a different amount of villagers in each type.
...Oh man, I can only dream of that happening for the next Animal Crossing. PLZ NINTENDO, DO IT.
I would definitely want more. 10 is just too little. There are 8 personalities alone, so if I got one of each personality I'd only have 2 spaces left! 16 would be nice, 2 of each personality.