#14 - March 10, 2010, 8:52 p.m.
I'm not sure we'd ever do a "deal damage to heal" model. It might work for new classes, but feels like a big change to existing classes that players know and love.
Having choices to get mana back is good. Standing around to regen mana is bad.
However, we still ultimately need a way that healers who are playing badly, trying to keep alive an undergeared / underskilled tank, or just tackling content that they're not yet ready for, can run out of mana to the extent that the encounter is over.