I can see a future where class "x" won't be accept in a party because it lacks dps.
Let me see if it's the player fault... Oh my God! No, it's not. Balacing a game is really hard and those things will always happen and parses will become a big problem. We'll also see some classes disappearing. The same as in wow, where we used to have a lot of shamans, when the last expansion arrived they disappeared. I kept playing a shaman but to find a group that allowed me to play as shaman melee was really tough, then they buffed shaman and everybody started playing it again and Rogues disappeared. No, it's not funny!