Quote Originally Posted by The Old Sage View Post
I am not "dead set" against alignment changes. I do like the idea of in-game actions leading to consequences that could change alignment and could even have the result of irrevocably (or without significant penance) result in loss of class advancement for paladins, etc. Not sure if that would ever see the light of day, however.
Alignment change is trivial in PnP.

From the "Atonement" spell:

Quote Originally Posted by SRD
Note: Normally, changing alignment is up to the player. This use of atonement simply offers a believable way for a character to change his or her alignment drastically, suddenly, and definitively.
Up to the player. Drastically, suddenly, definitively via a 5th level spell.

Maybe put a timer on it like swapping spells, but it needs to be in the game, ideally with the introduction of evil alignments and a broadening of the story arc.