I don't think it will ever happen. Kennywood is too much of a mainstay here in Pittsburgh, and boundless options are within a day trip (see my post on forum topic: "State with the most Buzzer's 2nd time.")
We don't have the population to warrant this, and with existing competition, it's very unnecessary. Besides, most life-long Pittsburghers take our home-town brands seriously, and Kennywood is right up there with H.J. Heinz and the Steelers, Pirates and Penguins.
-------------
Neil
Pittsburgh, PA