I think F&F Supercharged was a victim of "too much of a good thing". I think at the time, Universal got cocky from a (what was at the time) a very positive response from King Kong 3D.
So of course, instead of trying something new, they made the classic error of "If people love this, let's give them more." And now you basically have two of the same concept in the same tram tour. Which nearly made it pointless from day one.