If they were to use a WB IP in the Supercharged plot, IMO I would prefer Looney Tunes. There is a lot of cool things you can do with that IP in regards to spoofing things. As i mentioned over in the thread where you can pitch your own ride ideas, I proposed a LT Great Movie Ride that spoofs either Universal's own library or goes after Disney directly. I still think Scooby should have representation in Universal Parks, but that should take over The Simpsons Ride when the contract expires with a stacked dark ride themed to either a haunted house or if they wanted to break away from the haunted house trope, a haunted theater.
I hope Universal eventually takes a break from the SCOOP and tries a new ride system for large scale dark rides. Patents were filed not too long away for a theater like ride system that can break away and become a set of traveling ride vehicles. They were also patents filed for autonomous ride vehicles as well as ones that can be guided with infrared light. I would like to see Universal try new ride concepts with the patents I mentioned.