They'd probably put Marvel (if they could work out deals with Universal) and Star Wars. It'd probably make sense to put Titanic in in a similar way to Casablanca. Both are a similar theme about lost love and going on. Lord Of The Rings has no theme park representation strangely enough, so maybe but I wouldn't replace the Alien scene like they were talking about doing with it. Maybe have some Star Trek Wrath of Kahn oh wait that's too old....errr.... Avatar? What could they even do with that other than repeat Navi River...
Its hard because there aren't a lot of big blockbuster movies that can be placed into a ride nowadays, I mean lots of them are specific to rival parks like Six Flags or Universal, and many are about complex themes that don't compute well into a ride.
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If you look at these many have already had rides or are just Disney Movies, some have had rides in other theme parks. Maybe some James Bond or Hunger Games, but how would you incorporate those?
The Great Movie Ride worked well as a celebration of classic old movies from the heydays of Hollywood in the 20th century. Perhaps it should have been upgraded but still kept that theme. You got the westerns, the pre codes, the scifi, the fantasy, cartoons, romance, and Adventure and horror are kinda combined. I'd say just update the animatronics maybe add new lines, switch it up a bit and possibly add Lord Of The Rings somewhere maybe over the Tarzan because Disney already has a Tarzan character and it may be confusing. Imagine like a Mines of Mordor scene with a big Gandolf going YOU SHALL NOT PASS! or something