They might cherry pick assets though, or buy it all and sell the parts they don't want. While SeaWorld as a brand is tarnished, the property here in Orlando is prime real estate that could easily be re-developed into a third theme park (minus all or most of the animals) without having the hassles of having to deal with neighbors and other problems they could find with other tracts of land that might be available.
While the other properties may or may not fit with their ideas for expansion, the other parks are valuable assets that could be sold individually to other companies to help finance the transaction. Between that and getting the Sesame license, it could be a really good deal for Comcast. The two Busch parks and even the Texas SeaWorld each could easily find buyers (Six Flags, Cedar Fair, Herschend). The only parks that would have shaky futures would probably be Sesame Place and SeaWorld California, but their assets could even be sold off to other companies. Disney wanted to buy Discovery Cove when the parks were up for sale from AB.
When it comes down to it, the SeaWorld parks just became a bargain, dropping from a value of around $5 billion to around $3 billion in two days.
Now, SeaWorld also said today they are making a "ground breaking" announcement tomorrow on the Today show...