Far and away the most attended parks in the United States are.
#1. WDW MK
#2 DLR
Disneyland.
Neither of these parks have a single ride beyond the category of intermediate thrill ride. And MK only has 3 of those. They are Splash, Space, and Big Thunder Mountains respectively.
Disneyland has Splash, Big Thunder, Space, Matterhorn, Indy Jones, Pirates (It makes the category here but does not at MK) for a total of 6.
So certainly in their two headline parks, Disney isn't on a thrill ride binge, nor does it need to be.
Now let us analyze the other parks.
There are only 4 rides in the place I would consider beyond an intermediate type thrill ride.
TOT and RnR. Both of these are at MGM.
Everest, the new one at AK
Mission Space at Epcot.
These are fairly new.
Now in the category of intermediat thrill.
We have 2 at AK in kali and dinosaur
We have 2 at Epcot in Test Track and Maelstrom
We have none at MGM.
Now keep in mind all these parks beat out USO and IOA in attendance last year.
Out to California.
DCA has 3 rides I would consider beyond an intermediate thrill ride.
Ca Screamin, TOT, and I think it's the Maliboomer but I'm not sure of the name.
Yet DCA passed up IOA last year I believe.
Now there is an argument that Disney needs to put thrill rides in these parks to capture some of the niche going elsewhere. I would say that's a fair statement. But I don't think they need to go on a thrill ride binge so to speak, to survive. Plus, these 3 parks needed some updates in some cases, more rides in general in others.
So though I am certainly happy for more thrill rides, Everest looks like it's going to be a dandy and stand the test of time much like Space, Splash, and Big Thunder all have. But I don't think Disney needs to, nor should get into an ours goes 110 mph. No our's goes 115. Well ours has 5 inversions. No ours has 7, pissing contest. And it doesn't seem to be the case that they are.
I also don't think Disney is going on an excessive thrill ride binge. Pooh, Buzz, Monster's Inc, Soarin, these are all rides they've done fairly recently and they haven't been thrill rides.