Who said it has to be as big as Springfield? If anything,
@SnideRemarksDept hit the nail on the head, and I think the smart play is to not make it as large as Simpsons to begin with.
And yes, I genuinely think it'll lapse in 2028. We are seeing it already with the USJ Marvel Contract, that Universal is intending to wipe their hands from Disney in the terms of contracts that actually have an end-date. Why would they think logistically to extend the contract?