so no NPC's or monsters will have have their spells, spell-like, and supernatrual abilitys in your dead magic zone man thats going to be alot of work on your part changing all the CR's
and stuff. the trasure chart would change to man good luck.
It's like having a cleric built into the character.
They don't help in combat, just between combats, so you'll need to consider how characters might be able to recover in the middle of a fight; which does become essential.
That sounds pretty good. You still have the problem that during longer episodes with a lot of action (like a dungeon crawl) you'll need some serious rest to replenish reserve points or you only postpone the inevitable.