Much like Laputa Castle in the sky, what if the sky limit could be increased another couple hundred blocks to eventually host more clouds to hide a floating abandoned advanced civilization powered by redstone? It might add a really interesting narrative to minecraft about the villagers no longer Understanding the ways of processing red stone and it being up to you as Steve or Alex to rediscover the lost abandoned red stone city floating about the minecraft world. The player would need to find a way to craft a flying method to get to that abandoned civilization in the sky. i think this might need the help of experienced players to build a megacity with submerged sections and open sections of this floating Red stone city who's inhabitants are long gone.
Maybe adding some extra large villages connected by larger train tracks will add a new way to explore minecraft.