In which case my sentiments echo De-Legro's: the rule should be re-written to properly reflect this reality. The rule saying nothing about the debatable aspect of "forcing" another to become a place holder.
I agree. I can definitely see how the placeholder rule, as read, could be interpreted as invalid pertaining to this particular case, and therefore unknowingly abused by players in the future. I think it could use further clarification, as I don't fully understand it myself, and I feel I have a pretty decent grasp on the English language.
HOWEVER, threatening to leave the game just because you lost your position puts the authorities who make these decisions in a tough spot. Say, hypothetically, that Anaris (or the "titans", or whoever) were to give in, lift the ban, and return Erik's position(s)- then every person who gets upset about any decision in the future will know that they can get their way by throwing a tantrum and threatening to leave. Either leave, or stay, but don't try to guilt your way out of a situation with threats.
Finally, if you truly believe this game is all about the RP, then losing your position shouldn't matter, should it? In fact, "long-standing Duke loses his Dukeship and is now a pauper" is a WAY more interesting plot point than "long-standing Duke continues to have his Dukeship in perpetuity".