At the very least BW/EA/whoever is pulling the strings here should put in some effort to end the individual stories in a satisfactory manner. Rather easy to do too at this point. Act 3 basically had the common theme of the war between the Republic and Empire flaring up again. After that, we mostly got sidetracked with peripheral matters like Malgus' betrayal, the Dread Masters rebellion and the Hutt Cartel.
Create another expansion that returns the attention to the core conflict, use that to tie off the individual storylines and from then on, focus on more common group focused content. At that point it would make sense given you are all focused on fighting a WAR rather than running off to the force knows where for random reasons.
Ideally I'd love to see them put in continued class exclusive content because that was the most fun while lvling plus it makes playing alts a lot less repetitive. But if Bioware does not wish or is not able to do that, at least give us a proper conclusion.