If Disney does indeed remove The Great Movie Ride, then I will lose interest in returning to DHS (or whatever its revised version is called). That may sound like hyperbole, but hear me out.
Disney's current strategy going forward appears to be copying Universal's. Not just in terms of building rides based on movies, but having a park with districts that have no real connection to each other beyond being based on IPs owned or acquire by the company. It's what Islands of Adventure has always looked like, and what Universal Studios Florida is turning into. That means in five years, Orlando will have three theme parks that essentially do the same thing. Given that's what Universal has always been to some extent, and both its parks are included in the same admission ticket, it very much diminishes the appeal of visiting the Disney equivalent. Worse, many of these new rides coming to DHS are copies or variations of what will already exist in other Disney theme parks (including all of Star Wars Land, the park's main selling point in the next decade).
When Disney-MGM Studios first opened it differentiated itself from Magic Kingdom and EPCOT by not only offering educational attractions, but practical studio facilities and Disney takes on other Hollywood films (Indiana Jones, Star Wars, Oz, Alien etc). It offered "interactive" experiences long before MM+, with things like the 50s Prime Time Cafe and the Monster Sound Show, and ways to frequently and appropriately promote current or upcoming releases (as was done with many parades and shows).
"Disney's Hollywood Adventure", doesn't appear to do any of this. Not only is the studio aspect gone (as has been the case for some time now), but there is no current effort to produce any attractions that relate to Hollywood history, nostalgia or anything that isn't explicitly Disney® as of 2016. It's just a collection of Disney rides and settings, that doesn't have any strong narrative concept to tie them together or even have the appeal of being centered around a lake like IoA. That GMR is being considered for removal before any of the tired stage shows have been replaced is also ridiculous.
The new version of DHS will undoubtedly be more popular than its immediate predecessor, but as someone who already visits Disney California Adventure, Universal Orlando and Walt Disney Studios Paris, I find it hard to get excited about a theme park that simply mixes all of them together for the sake of creative and financial ease. "Hollywood", as both an abstract concept and real place, provides many opportunities for themed attractions, as do the films not yet explored in this field by either Disney or Universal. There is no need to replace a high-capacity, ambitious, and exclusive attraction like GMR, with anything else. There is land for expansion, and other, weaker aspects of the park that could be replaced. Considering the price of admission, Disney should be offering more than a Universal imitation with recycled ideas. Even Eisner knew that when he decided to get his studio park open first.