While I will say almost, you did hit on the couple of areas of the park people wonder "Why haven't these gotten the ax first?" In particular, the Fear Factor show and the Barney/Curious George/Fievel area. Often times it appears that maintenance/budget issues take precedence at times. Not only that, but it also comes down to logistics. With the Hogwarts Express, Diagon Alley wouldn't have gone as well in the Barney area and there's not enough land at Fear Factor without also losing MIB. Jaw was a ride that was expensive to run that had maintenance issues. That appears to be the same fate that befell Disaster and Twister. 3 attractions that relied heavily on practical effects that were becoming more and more expensive to maintain.
On the Barney front, we will see. The rumor has that area will be closing to be converting into Nintendo. Replacing one kids area with another kids area. Of course with rumors of a third park on the horizon that could change. Unlike Disney with DHS, They have been taking the reinventing of USF one step at a time. You've not had a situation where large sections of the parks are closed. You may have had a lot of construction walls especially when Transformers was being build, Diagon Alley was being Build, and World Expo was being rebranded into Springfield. But only 1 ride was closed. Transformers was going into a "sound stage" that was primarily used for
HHN, and the Simpsons ride stayed opened during the rebranding of the land around it.
So in short, It still feels like Universal is still in the middle of it's transformation from 1/2 studio, 1/2 park to immersive park which surprising still does a little bit of filming in it. DHS until recently has seemed to be 1/2 park,1/2 fake studio.