Except for RP reasons, I really don't see any use to such an option, and RP players are such an incredibly tiny minority in comparison to everyone else (who might accidently end up hitting the option), that this seems like a huge waste of resources.

If you didn't want to play the class, why did you level it in the first place?
If you don't play it right now because you don't like it this patch/expansion, well, do you want to go from 1-70 again next expansion just because you suddenly like it again?
So much pointless time-wasting..please no.