Personally, I think they should take Lyth's idea and make Dark Mind give us some physical mitigation of some sort. If they don't want to change DRK's place in the mitigation landscape in the endgame, they could make it give +20% evasion on top of the magic mit. Evasion is underrated, and it would have no possible negative impact on today's DRK, since Blood Price no longer exists. It had its place in the old days too, namely after Blood Price went on cooldown.