Since Minecraft and the Gaming Industry in general is constantly updating and coming up with new ideas/game many kinds of features get to see the light. Meaning that there could be some original ideas for Minigames. Doesn't matter if it's copying another game or it's a completely new idea.This is a problem every server has to deal with. Evrything that was able to be done has neen done. Now each server just copies each other and adds a little twist to make it seem original. All good ideas have been utilized. There are practically no servers that can sustaim themselves with only original gamemodes.
The only questions are:
Will it attract players?
Can it be done with the Spigot API?
Will it sustain popularity?