If the new south park is envisioned by Universal to be it's answer to Magic Kingdom, an expanded SNL concept as the park's anchor will be a natural, and definitely the right long term business decision. This all hinges on a fast tracked new park. If that is indeed the case, Comcast/Universal executives would be greatly remiss if they didn't utilize their strongest IP, besides Potter, as the anchor.
Bingo. It'd be a waste of an IP to push it into USF just because it will be a year or two earlier rather than expand on the concept as the anchor it deserves to be. It also recognizes the fact that there is no other 'major' family IP out there big enough as an anchor.