There needs to be a more severe punishment for quitters...

[Chocolys]

Adding an additional harsh penalty would also act as a double undeserved punishment for someone who would have an unwanted long (more than 5 min) disconnection from the game (because if such penalty would exist, you would have to penalize disconnected people as well, else people would force a disconnection on purpose to work around the penalty).

Not only that but a player who wants to leave a dungeon without getting a penalty, could then simply go AFK or provoke wipes just so other players would votekick him out, or quit themselves.

So it would not solve anything. I think 30 minutes is already a penalty enough anyway.
The real issue is the imbalance in population between tank/dps/healer. That's what need to be fixed.

[infinitezero]

(snip)

You raise some solid points here. Maybe a harsher penalty is not what's needed, but perhaps more incentive to play a tank or healer other than in extremes and coil. I still don't get why they did that, as that's such a small portion of the game compared to the earlier levels where these classes seem to be needed most. It could have just as easily been complete x amount of this level roulette, y amount of this level roulette and so on, and I could almost guarantee that threads like this wouldn't even exist. Wouldn't argue against some new and interesting tank and healer classes or abilities to make the current ones more interesting to play either.