Villager Mechanics changed in 1.8. Villagers now farm and this is essential to self-reproduction. Unfortunately, since the upgrade they have not been doing this and this has caused their slow extinction. It took some time to discover that the farming action and food sharing is considered mobGriefing which was disabled. Don’t worry, I’m able to disable Creeper block damage without having to use such a blunt instrument as the “mobGriefing” setting.
Villagers will now farm again and naturally reproduce on their own. The Villager Breeding and Repopulation Program is now in effect and our engineers are working hard at cultivating the remaining population back to self-sustaining levels.