Maybe they are planning to expand Darien Lake... The GTA(Greater Toronto Area) is growing quite rapidly, and since Darien Lake does offer admission prices at Candian Dollar value, the park is attractive to many Canadians.. The name Six Falgs is practically a household name...
Regarding SFKK, a few years ago when they built Chang and during the Six Flags takeover, they did a mass marketing campaign in Cincy, which didn't really do that much. Also, even if Six Flags wanted to build something here, they are completely landlocked by the Louisville fair grounds, an international airport, and two big hotels.