And F&F or the Simpsons or Transformers or Potterland fit in USF?
USF is abandoning "how the movies are made" theme. Necessarily so. And even with that theme, the movies or genres that were being made was as much a mishmash as IOA islands. Nothing coherent.
Over at WDW, we dream-armchair about moving It's a Small World and Carousel of Progress to Future World where they'd fit better and Guardians to Tomorrowland... one can dream.
Similarly, years from now, if there's an immersive UCM land in their 3rd gate and HHN is still at USF, Universal fans and this message board are going to be moaning about how UCM-Land is left out of HHN.
Then Universal will make UCM-Land a lighter version of Halloween, like MK's Not So Scary and people will complain about how that ruins the UCM....
We can see where this is going.