I'm pretty sure that BioWare will eventually expand on the Class Story lines in the game. It just might take them a while to do it..as many people have pointed out already...that creating new Class Story content for all 8 classes is going to be a LOT of work. Voice acting isn't exactly cheap....it can be pretty pricy...as can making all new worlds for the stories to take place in. Not to mention creating completely new NPCs from scratch.