It's been something like 8 years since the release of world 2. Maybe going for all four worlds is pushing it, but the SAB festival is v. popular, and both of the SAB initial releases were wildly so, too. Expanding upon the game mode, even jsut for the next festival occurence, is not a bad allocation of resources, especially having just put out a new expansion. The continuation of the main story can wait a while, especially since, of necessity, it needs to go in a whole new direction now that we have no dragons left to slay.
I realise the people initially responsible for the adventure box are mostly/all no longer with the company, but that could make it a great opportunity. We have all played these six levels over and over until death has long since parted ways with us all - a fresh take on the material could be just the thing. And i don't know about the rest of you, but "excellence" and "Masters in applied jumping" sound pretty kitten enticing to me.