The original idea was to release bigger DLC but less of them. I'd say they have delivered on the first part, but with the two pretty hefty stories we have had, and Hearthfire to tide us over, i'm wonderign when the second will come into play.
One more small (Hearthfire) style DLC and one large one? Or do you believe we will get another two larger ones?
I'm personally going to not get my hopes up, and expect the next large oen to be the last. That way I can smile more if another is announced.