That Roger Rabbit was allowed to fade away is an indictment of both "Disney" and Spielberg. He's a great character that has both humor and heart. I'd love a Toontown in DHS that felt like Old Hollywood (when Hollywood had class) with toons - as long as they softened the Tex Avery influence and went more with Chuck Jones. But that again is yet another good idea today's "Disney" won't touch. Make way for more Star Wars, Marvel and probably Avatar crap. Gross.
I like Star Wars, Marvel and Avatar but I agree it's a shame what happened to Roger. From what I understand he was EVERYWHERE from about 1988-1993. Had Disney and Spielberg gotten along we probably would have had one or two sequels, much more Roger Rabbit shorts, a bigger Roger Rabbit presence within the theme parks and probably more Roger Rabbit appearances throughout all of Disney media — House of Mouse, Kingdom Hearts, a Disney plus show, etc.
Unfortunately, due to issues with Spielberg Disney completely stopped promoting the character. While he's fondly remembered by Gen X and older Millennials I'm sure to Gen Z he's just as obscure as Brer Rabbit! And that's a shame.

. He had the potential to join the ranks of Goofy, Pluto, Minnie, Donald and Daisy as one of the core Disney characters.