I, for one, would like to see dialogue options open up based on the player character's attribute and/or crew skill scores. For example, giving players with high investments in diplomacy crew skill a dialogue option seeking non-violent quest solutions, or those with underworld trading occasionally given the opportunity to haggle for greater quest rewards.
Elements like these in Bioware's single player games made an huge impact in the depth of interaction, replay value, and enforced a stronger connection between player and character; and I don't see any reason why it wouldn't be the same in an MMO setting.
I can see how balancing would be a monumental task, not to mention the logistical challenges involved in writing alternate quest endings and recording additional voice overs, but seeing as how Bioware's made such an investment to allow players to play as that smart talking scoundrel, why not push that system even further and give that scoundrel the option of slicing, haggling or talking his way to alternate quest solutions?