I forgot to mention this, but the main reason I'm not particularly upset about the current crew not writing for the movie is that now they can keep on writing regular episodes for the show. So we'll have a team writing regular episodes and a team writing the movie, and hopefully there'll be no need for a hiatus and the movie won't impact the episode quality in any way.
You've got a point, actually. Now we don't need to worry about episodes going back down in quality because of focus on the movie. That way, the main SB crew can go back to Seasons 1-3 quality and focus on that, there is a chance now, even though I think it is slim. Hopefully. :)