I rode the Nuthouse coaster for the first time in years Tuesday and when I got off, I said this: Donkey Kong Mine Coaster. The ride was built for two train operation with the extended brake run, so it is a matter of adding the transfer track and voila: you got a cheap and reliable B or C ticket ride to help absorb the heavy Nintendo crowds. If they keep the Donkey Kong license for a larger scale ride, the possibilities are endless to retheme the Nuthouse Coaster.
I figure the second train was not added back then because the old Hard Rock Cafe was in the way. Now that it is gone, Universal could easily modify the ride.