While DoT damage from the same spell may stack I doubt that any debuffs of the same type will. We'll still need other classes with noxious debuffs to help out. That isn't going to help our AE dps much though unless I missed them giving AE noxious debuffs to anyone but us. This is just an assumption mind you. I'm basing it on the fact that they seem to be slowly but surely turning everything else in this game into its EQ1 counterpart

.