I like this idea alot :D spiritist as it is now is nice I'd find it a bit sad I won't be able to use my staff anymore but this way it'll be even more interesting,a real challenge! I deffiantly like the idea! (and partly cuz I want to see the spell Banshee back available to us ;p)
Hope it comes into the game. Though I have one question: ATM I'm lvl 100 spiritist does that mean I'll have to restart from scrap, lvl 1?