I wish people would understand that most of the time, people don't run from the duty but from other people. Of course there are some duties that just make you not care how long the penalty is (e.g. thousand maws of total bore) but i believe most of the time people just leave because they are fed-up of being forced to group with strangers. A harsher penalty will only worsen this problem and make the general mood in-game get even worse.

Every MMO offers a certain amount of solo/small group content and that's good because forcing people to group with often horrible players is not the way to keep you playing. I usually try to avoid roulettes unless i can do them with my friends because no, I do not feel like carrying the next bad tank or early-pulling DPS. I don't have to get abuse because a tank can't use his CDs or the dps has no aggro management.

I really hope the Palace of the Dead is only the FIRST STEP to alleviate the "party forcing" this game usually runs with (alas, I will reserve my verdict until after it is released). A good MMO does not force you to group up, it gives you the possibility to do so.