The new movie will be a marker for how much juice in left in the tank for the Simpsons IP on a mass-market scale. I don't personally believe many people are drawn into buying a ticket for Simpsons attractions in 2027 and beyond.
... But, maybe that doesn't matter too much. They've got Potter, Pokemon, Nintendo, or whatever new coaster they just built to draw people in, and if Duff and FFB sales are chugging along fine amongst them, and Disney has no immediate plans with the IP, it's a (personally worrying) possibility that this massive plot goes untapped for a good while longer while UDX focuses on Epic and UUK.