I've always liked hairless kitties too! They look so different, yet so cute! I'm always up for new additions, so why not! I don't think it would require changing the sculpts, as a good texture could do the trick!
But having skinnier/chunkier cats would be nice also, you know, maine coons tend to be massive and ocicats are usually skinny, and so on. But it's not a must, Kittycats are lovely as they are.