Would it be just a mage/warlock that shoots red spells? probably. But still, we need a bloodmage that specializes ONLY in siphoning off life from enemies to bolster themselves. Probably even just take warlocks drain life and give it to this new class. There is even a blood mage IN GAME in the burning steppes.
I’m talking about long term. and you’re right whenever Blood DK is good It’s really, really good. Not that I hate the idea I just don’t think it’ll happen again. Especially as a dps class. If Blood DK ended up being the other dps for DK it’d probably be one of the most broken specs in the game on a regular basis. Moreso than it is as a tank.