I hate the fact that it takes hours for sometimes a minigame to pop. I say that it should auto pop after 10 min if it hasn't reached its capacity.
so if there is 8 players 4 on each team (if there is only one healer, the healer can only heal themself until another healer is on the opposite side)

If there are 9 players, 4 on each team will be chosen. The last to sign up will be on a wait-list for one more person to sign onto mini in which there would then be 5v5. (or if someone leaves the mini early 4v4)

I am afraid that if ppl are waiting around too long for a mini to start (like hours) they will loose interest in the game and the game will die. I think this is a great way to have constant pvp contact in minigames. (basically like bori but minis are constant)