As much as I enjoy the Simpsons Ride and its humor, I could see it being replaced down the line... by another Simpsons attraction. Even if the show is fading into irrelevancy, its still iconic, moves tons of merch, and has one of the most popular quick services in the park. But the current ride system is seriously showing its age, plus if it was replaced by something with sets (or even a mixture of sets and screens rather than a full simulator) it would be a plus for the park IMO.