This is a little far-fetched, at least for the near future, but I thought I'd throw it in to the mix of possibilities.
It's been speculated that another major flat is on it's way to SDC in the next 5 years, and that it will be most likely furnished by Huss. Huss has already supplied at least one ride for the Herschends with Timberrrr Tower, the infamous topple tower at DW, and was almost chosen to supply a similar model at SDC in 2007. Since the recent major problems of the Timberrr Tower at DW, the Herschends have likely turned their backs to Huss, but there aren't that many manufacturers to go to for large flats. Huss has a good following generally, but Timberrrr Tower had been a rare blemish on their name.
During the 2007 new ride survey, a Huss Frisbee concept was featured alongside a topple tower similar to TT and the Screamin Swing which ended up as the chosen ride for 2007. Here's how the Frisbee was described:
Silver Dollar City’s new Grand Exposition has just gotten bigger. Standing behind the Red Gold Exposition Hall is the Exposition’s newest ride, one of the most exciting rides ever built at Silver Dollar City, The Amazing Pendulum Swing. This new ride is the featured attraction at the Grand Exposition of 1882, standing nearly 75 feet tall, with a giant pendulum arm that swings riders back in forth while rotating over 110 degrees. This unique attraction is not for the faint-of-heart as it reaches speeds of nearly 60 miles per hour as it swings back and forth, high above the grounds of Silver Dollar City’s new Grand Exposition. The ride soars out over cascading water and shooting fountains that spray bursts of water onto some of the riders, adding yet another element of thrill and suspense to the attraction.
So it seems like it could be a strong possibility that SDC will go back to this concept, as it was definitely an attractive one. I personally hope they do, as Huss Frisbees are excellent rides, and are usually regarded as favorites among enthusiasts. The only problem standing in the way of such a ride would be the Herschends distrust of Huss. If it came down to it, the Herschends could always go to Intamin for a similar ride, but they don't make frisbees as well as Huss. Really, Huss has only ever had major problems with their topple towers, and they do have a good reputation, especially for their frisbees, but will the Herschends see this?