It's something that would bring in money for sure, as long as it's done properly and there is a decent amount of story content .... and perfect example being with 'Legacy of the sith', it's already showing how a story can be made extremely well with just a skeleton team, I mean even the cinematics have improved with the animations, the camera angles.. it really feels like it's back at it's roots once more.. though I do hope this story is expanded on going forward and with more people on the project with the inclusion of 'Broadsword'.. it's certainly possible.
I for one play SWTOR mainly as a solo experience so for me personally, they give us more story and I'll pay for it. I do dabble with OPS too but my main focus is story.
As for classes, I've ALWAYS said, going back to SW: Galaxies, make a dancer/Musician class so we can get buffs for our characters by being in a group with the person performing and they get paid with tips from players for performing and doing weeklies for their class with specific missions like 'Dance or play an instrument for 100 people' .. also giving the class a reputation bar where people can rate them.
Also, a trader specific class, again going back to SW:Galaxies. A trader class would have the benefits of being able to have 6-9 crew skills, and be able to send out 10-12 companions for crew missions rather than the 8 we have now. Also they'd have their own weekly missions for experience.
For combat combat classes, I'd like to see a:
-Battledroid class for both rep and emp, we could be an upgraded version of the HK series.
-Beast master class which is like the hunter class from LOTRO, where you can train a beast and have it run through the game with you. With this class your beast wouldnt be classed as a companion, so you'd have the ability to be in a 3 person group, You, your beast and your companion (Only with the beast master class).
New Faction being 'Mandalorians'. A whole new expansion origins class story for the faction. It would be the perfect time to add a new faction to SWTOR especially with whats going on in LOTS.