Why is everyone assuming JP4 is a done deal? If anything, it's far from. Spielberg came out at Comic-Con last year and said #4 is 2-3 years away. Since then, the project has gone cold. There's various rumors stating JP4 may actually be a reboot; the start of a new trilogy. While others suggest JP4 will be a direct sequel to JP3. Regardless of what path the movie journeys, in short, if JP4 does ever happen it's many years away.
Regarding a potential new ride, I still favor a coaster. Wither it be a wooden, flying, or mine train.