Obviously, the only thing this ride needs is for something to go wrong.
I think what we're going to start seeing, and what the adult fans are going to have to start coping with, is Universal's efforts to broaden its demographic. KidZone, as it is, is a combination of woefully dated and narrowly focused. Barney and Curious George start becoming actively unappealing once kids turn 6-7, and few people under 15 know anything about Fievel or Woody Woodpecker. More importantly, there's no actual RIDES for kids in the Studios. Even the simulators have height restrictions. The only tame "kid's" ride in the park is themed to aliens from a adult cartoon who want to take over the planet.
I can totally understand the fans on here not wanting Hello Kitty, especially at the expense of Simpsons. But Nintendo is going to drastically increase the amount of families, with kids, at the park. Yoshi and the playground, though kid-centric, aren't going to be "enough." Even if Hello Kitty is hyper-cute to the point it induces sickness, kids (especially young girls) will likely love it. And that pushes merch.
Yoshi, Sanrio, Secret Life of Pets, the writings on the wall everyone. Universal is actively looking at ways to engage children... you know, the markets Disney has owned for decades. P4rk will likely be more of the same.