This is purely circumstantial and vary by guild, circle of friends and personal preference etc, this is where the game have limited control over.
Best way to limit stacking of a certain class will be the introduction of party buffs; where when you get all 3 class in a party the party leader will have to choose 1 of the buff bonus for the certain run/map: 10% damage, 10%exp, 10% speed, 10% armor, 10% mana or 10% hp. This will kinda push people to run and organize party where theres only 2 of the same class.
And the skill update will play a crucial role in future expansions, as the value of stats gets higher endgame stats makes skills overly boosted.
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