first of all i thought medivh was mage, and second to me monks are somewhat sage like. just the asian variation if you will.
No point in having new classes when Blizzard is incapable of balancing the original ones.
Oh I hardly mean to introduce yet another new resource. It was just the idea of gaining 'energy' from nature, which is the base of the sage mode in naruto. This energy can be well energy like rogues got, it could be mana, which would mean we could get a mana using strenght or stamina spec which isn't that common So the spells to gather the resource would be connected somehow with nature and shit :P