In reality, what Mango said.
Though this will just justify the idea that every single game ever eventually turns into a racing game. See Crash Bandicoot, Mario, Spyro, Ratchet and Clank, Jak and Daxter, Pokemon, Yugioh (5D's), Grand Theft Auto, Grand Theft Furry, The Simpsons.... the list goes on and on and on and on.
But in all seriousness, if someone makes a /good/ map with all of the technical stuff worked out, and a valid game-mode, then I would love to see a karthell exist. Until then it'll be abusing teleporters on the event map....