Well let's see.... seeing as most MMO Vote Kick systems count premade groups like your "3 trolls" as only 1 vote and stack a lockout cooldown that grows exponentially with each time the kick feature is used to prevent abuse those "3 trolls" won't be able to do that in the first place.

And even if FF14's system doesn't implement such restrictions its about 100x easier for 1 troll to afk/chest farm/harass/etc a DF without a vote kick system then for 3 trolls to rally together just to abuse such a kick feature so its a risk I'm willing to take.