We've had mini-games and they have all slowly died down, we don't have an enough stable community to implement this, maybe in the foreseen future we will but currently it's pretty impossible to add them. First all v2's are lined up and by the time they're done, they'll slowly start implementing creative new games.
You should know that game modes like Skyblock, Skywars and Bedwars need so many players to be played, suggesting this in foreseen future might actually get it implemented though but right now there's a little no possibility of them being implemented.