That depends entirely on how much DPS requirement there is to down the encounters. The only reason DRK would be desperately after a buff is if if the physical tankbusters are -really hard- to mitigate with their kit.

Paladins don't really have a huge problem with the magical stuff in Alex right now, it's the combo of noticeably lower DPS than DRK/WAR along with no meaningful impact on the encounters from their benefits. If Alex part 2 was entirely physical you'd probably see an equal amount of WAR/DRK and WAR/PLD groups clearing it depending on dps requirement.