It seems 1.10 is coming out soon. It doesn't change worldgen much, but it does add fossils in deserts n swamps. So when the update comes out, how about regenerating all the areas without player builds? That would result in more villages and the fossils. Just a thought. Feel free to critisise.
You can't get villagers from the mining world to the main world tho. Or can you? I think I'll just settle for another railway to a village.