I've heard rumors of Jaws since it recently went seasonal.
I'm going to go ahead and say Fear Factor Live is going to be the next attraction to go, and I think we'd all agree there.
As for the rides, I have a feeling that it will be either, unfortunately, Jaws or E.T.
Twister, Disaster, and Men in Black encountered the LONGEST waits at the park when I went last week. All day, Disaster was 30+ minute wait; Men in Black was 45 most of the day, and Twister was always 15+ minutes (well, 15 minutes is too long for me to wait for Twister...it just sucks). Also I heard that Twister went seasonal, but due to popular demand and complaints, it was reopened just weeks later, leaving it to be a full-year attraction. Unfortunately, it's not going anywhere.
Twister, T2, Jimmy Neutron, and Jaws are highly irrelevant in today's society. Most little kids don't know about these films, and most people don't even know that Twister is a movie, and Jimmy Neutron is old news now.
Replace Twister with some sort of Hurricane simulator. Replace T2 with a Terminator: Salvation attraction of sorts. Replace Jimmy Neutron with Spongebob or Avatar. I hope they don't replace Jaws, but if they did, they could create a Creature From the Black Lagoon ride similar to Jaws, with the new show at USH and the new movie coming out next year.
There's my two cents. Like it or not, take it c um (it blocks out the world put together) grano salis.