Let's be clear, though - Fast and Furious was a languishing franchise before Fast Five (and to a lesser extent "The Fast and Furious," i.e. the 4th one). Diesel returning to the franchise gave it new life and made it the unstoppable power house it is right now.
It's also really not an easily translatable theme park property at all - the only ride options are some sort of roller coaster (probably indoors, ala Rock'n'Roller Coaster?) or a Test Track-like experience, which Universal has never attempted. In both systems, you face the same problem: how do you actually convey the tone, characters and world of the property? Universal has never really successfully pulled off realistic human animatronics, so physical environments seem like a no go. The advent and ease of development of the 3D motion ride (Kong 360/Transformers on) gave them a new option that allows them to fairly cheaply incorporate all of the high speed, over the top action AND the film actors (The Rock, Diesel, etc.) That's why we're getting Supercharged now. My bet is they're still trying to R&D a way to expand Supercharged into a standalone experience for the Florida parks -- it isn't nearly as easy as KONG, which can be a slow moving ride if necessary. Fast and Furious has to be, well, fast.