Licensing isn't the thing that prevents big budget productions from happening. If they wanted to make a bunch of big budget Marvel movies in 1992, nothing was stopping them. They'd have just paid for the rights back then, the same as they do now.

What copyright expiration would get you that you don't have now is tons and tons and tons of fan fiction and small budget productions. A few of which would have been good and most of which would have been both terrible and ignored. Like every school play being Shakespeare, but now it's Spider Man.

And heretical crossovers. Deadpool vs. the Joker and things like that.

But Tangled, Frozen, Little Mermaid, Alice in Wonderland, Beauty and the Beast, all the Peter Pan movies, they're based on public domain stories and they're still making major films out of them on a regular basis. The Snow Queen is one public domain fairy tale, Frozen is three movies.