You already have the means and formula to do so.
You released what, one episode a month for the new stuff, you can do the same thing for class stories by releasing one episode per month each month hitting a different class.
i.e.: 1st month start with a jedi knight story, 2nd month release a sith warrior story, etc etc...until you hit all the classes and then start over with part two.
Come on you can do it.
My bounty hunters want to do bounty hunter things, like bounty hunting (and no the bounty event doesnt count.) and being a hired gun.
My Sith wants to do sithy things like kill my rivals, kill jedi and or turn them to the darkside and strengthen my power base.
Etc etc.