They can crop any movie digitally.
What many people don't realize is that 35mm films are actually equivalent to 4K resolution and 70mm films are equivalent to 12K resolution!
As long as the original 35mm and 70mm films are in
awesome condition, they can scan the films to 4K digital and have awesome picture quality.
That's why Christopher Nolan continues to use 70mm films for his movies. Yeah, if they ever have 12K BluRay, he can scan his 70mm films to 12K and not miss a single resolution.