Honest question: Is there a reason why Disney can't just renew their contract with Universal?
Thay may sound like a dumb question but think about it: If Disney doesn't have the opportunity to make any direct profit from the Simpsons at their theme parks, why not just let Universal keep it and continue to make some already existing profit from the percentage Universal is giving Disney. It's free money for Disney.
If Disney just cuts it off, there goes that free money from Universal. I'm not legal or financial expert here, but unless Disney has plans to introduce their IP into the theme parks, why not let Universal keep it around a little longer?
Of course I could be wrong and Disney might be like "Nah 2028 is it. Gimmie dat."