|Penguin_Witchdoctor Goblin Squad Member|
I am hoping that from an RP stand point if you lose the use of the ability through whatever circumstance. Example (Paladin hunting goblin children) That said Paladin maybe Rping on his way to anti-Paladin, and once his alignment gets to CE he can trade the Paladin abilities in for Anti-Paladin abilities. Example (Detect good for detect Evil)
The part for factions being able to trade abilities I could only see fitting if you so outrage your original faction the enemy faction would do the same thing, but at a reduced amount like maybe 50% of your previous faction. This being because they are leery of you maybe being a double-agent.
The best example of faction dropping I can thing of is Eando Kline. He found a serpent burial chamber while on a pathfinder mission, and saw it was to dangerous for anyone to explore further. He lied to the Decemvirate, and was actually found in the Serpent Skull adventure I do not remember why though. I know he does not join the Aspis Consortium though. He has just made it his mission to stop anyone from unleashing the serpents.