Was just thinking about something regarding TOR and that is with their focus on story could you see future content patches for the game contain the usual stuff we would expect like new Ops and Flashpoints but also new solo content that would progress your characters story but not progress your level? Basically making it to where any level cap increases would still be reserved for expansions. Granted if BW is even thinking about a level cap increase of any type.
Since they've announced that different romance options will be available in future patches this could be a way they implement those new options along with other story options with new companions, existing companions or both.
I mean you could have whole new story arcs. Arcs for class, factions, new companions, old companions, new and old worlds and so on. For me I could see story progression being enough for me to keep playing even if my level remained the same til the next expansion. It's just a theory but I could see that happening.