Make it where at night 1 section of each wall drops so a -f-e-w- mobs get in but have 2 iron golems stationed at each section of each wall and see if 2 is enough and give us the percentage of villagers lost each time
Maybe they might add a new village instead replaced with the old one. I felt that villages need more decorative and defensive features such as a think oak wood planks and cobblestone wall surrounding the village and add a pond. I would love the villagers to be able to hold a fishing rod and fish for fishes. Then they will maybe store this fishes in their houses that contains chests as well as those villagers that were able to farm. This will ensure that villagers are well protected and stop scattering around the world Maybe I should create a villager improvement thread :/
I would see if the villagers react accordingly to complicated machinery. By that I mean if they get explodified and make other things go boom. Also give them jobs with meaningless titles (Junior Assistant Manager In Charge Of Certain Things) to make them feel good about themselves.