I've always wanted a CATS animated movie that depicts the characters as actual cats (rather than people in cat costumes), with either Don-Bluth-style traditional animation or more modern "hyper-realism" CGI. But I wonder if that would take the "theatre" appeal out of it for other people. What do you think?
I'll be honest, I've never really been in love with the idea of making CATS the musical an animated movie. I think the designs that exist from the proof of concept are cool, but there's also definitely reasons they struggled to take it past that stage. This is not to say that Eliot's poems could never be adapted into a children's animated movie, but I think making it specifically an adaptation of the stage show is what makes it iffy. I'll try to break it down more under the cut:
Problem A: at the end of the day, CATS is a dance show. A lot of the show is just dancing, and very involved dancing at that. What are you supposed to do with the 9 minute dance break from the Ball? It's too iconic to cut, and the non-anthropomorphic cats ironically don't have the articulation to pull off a lot of the dance moves. (I'm thinking of movies like The Aristocats for comparison, which really doesn't have the characters do much that actual cats physically couldn't. I guess if it were more like An American Tail it wouldn't be so jarring, but I'll get to that later.)
Problem B: CATS has too little plot for a traditionally structured movie. The 2019 version also ran into this problem, which of course it solved in the worst way conceivable, but it's still a problem. Movie and theatre audiences simply have different expectations, suspension of disbelief, etc. that CATS is too theatrical to cross over into. I think it would be really interesting to make a Fantasia-like movie with each of the poems/songs being a totally different short in an anthology, but I don't think that's what most people are imagining when they say they want an animated CATS movie.
Problem C: what do you do about humans? The cats of CATS live in a world clearly populated by humans, but they're never shown directly. Adding humans, to me at least, clearly poses a "power creep" problem: any adult human can easily overpower any cat, and also leans the movie towards a more plot-driven story (as I feel like a lot of animal movies with humans tend to have a human antagonist). On the other hand, you could just make the entire world be populated by cats, which would (mostly) solve the dancing problem. However, I feel like doing that misses the point of the original poems: to illustrate the different types of pet/stray cats. It's not as funny to imagine Skimbleshanks being in charge of a group of feline train workers (which could be a completely normal thing within talking-animal movies) than it is to imagine an entire train full of humans and the orange tabby cat who thinks he's in charge of all of them. The same goes for Bustopher Jones, Gus, Mungojerrie & Rumpleteazer, etc., etc.