Here's a link to a recent interview with Al Jean regarding a second movie: http://screenrant.com/simpsons-movie-2-development-early-stages/
In the interview, he says “I’d say [it’s in] the very earliest stages. I certainly am cautious about a couple things. I wouldn’t want it to be risky in terms of budget, and I would not want it to be anything that we did purely for the money. I would want it to be a really great movie. I personally feel no need for another one unless it’s great.”'
So does this mean the show is nearing the end of the tunnel? We've heard other stuff like "they won't make another movie until the series has ended production," and "season 30 is likely the end." What do you think this means for the show?