Never under estimate Warrior or Paladin DPS. some of the best melee dps out there are these classes. and we will need them eventually.
Problem here is getting too much DPS. The ordai has a total of 29 mains, 24 of which are DPS. We have 2 tanks and 2 healers, if we're lucky, and unless they are online at exactly the same time - which is less likely than i would like - it raises a slight imbalance 
Also again. Druid tanks are some of the best in the game. they sport some wicked health pools. and Balance druids if done right can throw out awesome DPS.
Druid healers are bloody good too. I personally prefer drood healers as they have shineh buffs as well as heals. We want healers most at the moment, but if they can play them, then DPS will be given a trial. Hurrah! Also again, Shadow priests when coupled with a Paladin healer...means...NO OOM Healer
Good point, but we're a little short on pally healers.
Once we get a pally healer or two, then this would be a good combo. But this focus is a month-to-month thing.
And lastly... DK Tanks. When geared, and specced right, they can be potent. However, i've played alongside them long enough to know that they are the most difficult tanking class there is. Most times i've been in an instance with a DK tank they have either lost too much threat or have not been played right, and the instance has wiped. *looks down at the testimonies and giggles*.
Good quality Tank DKs are hard to find because they are a New Class, still in its infancy. Once all the kinks are worked out and people learn to play them properly, Tank DKs will probably begin to worm their way back into recruitment. LOADS of guilds have excluded DKs from their ranks altogether - that would be a little wasteful methinks. Unholy kicks out awesome DPS for example. But we odnt want to risk having a 70% DK guild xD.