I would not be surprised if they developed a third brand to separate the Cedar Fair properties from Busch Gardens and SeaWorld. Both of those parks are in a different price (and quality) tier. Busch Gardens Tampa and SeaWorld Orlando are charging $89.99 for admission. Meanwhile, I can get into Knott's Berry Farm for $59. There's also a certain level of quality you can expect from a Busch Garden's park compared to any of the Cedar Fair properties.
Alas, it was reported today that the deal between Sea World and Cedar Fair fell apart, so Sea World isn't taking over Cedar Fair. Or most notably, Cedar Fair rejected the takeover.