Also, something that should be noted, the elderly or those with concerns medically have few other rides to experience at the Studios without the GMR.
Tower of Terror - no
Rock n Roller - no
Star Tours - Depends but jostling can be a problem
Toy Story - Depends but jostling can be a problem
Backlot Tour - Due to walking sections it's difficult
GMR - Yes
* I may have forgotten a few, but you get my concern.
And based on the things I have seen, most of the rides being discussed for the studios are thrill rides, ala
Monsters Inc Roller Coaster
Carsland (there are some that might be tame, but the iconic ride is thrill ride)
Star Wars (Likely fast and thrill based, though little is known of plans)
One thing that makes Disney different from other theme parks, besides it's detail and cleanliness is that they have experiences the whole family can enjoy together. Also Disney has been a major force in having rides lasting decades, only becoming more famous over time. Many of the Six Flags tear down their historic rides to bring in yet another coaster, which in x amount of years will be torn down for another. Because of this, none of their rides reach the iconic levels of Space Mountain, Pirates of the Caribbean, Small World, etc.