I think it's important to note that a vast number (likely a majority) of visitors to WDW are not quite the Disney fanatics that many that frequent these forums are.
Therefore, when it comes to attractions, there are a huge number of park goers who will have absolutely no idea who Casey Jr is. In fact, there are going to be a huge number that likely have never seen many of the older films or are in any way familiar with all of the Disney minutia that so many here obsess over.
I count myself among this group. I'm a theme park enthusiast - I have a love of WDW because (1) it is still the premier theme park resort, as a whole, in the world and (2) I have extremely fond memories of my visits there with my family as I grew up. Aside from Bambi and Beauty and the Beast, I had never seen the vast majority of the Disney catalog of movies until I had children. I've still never seen Dumbo or Pinocchio and, frankly, have no real compelling interest to do so.
So what the hell am I getting at? What I'm getting at is that any new attractions need to be appealing to, and resonant with, even the most casual guests. Unless it's an extremely well known Disney character or property - either through a film/show or an existing park attraction - there's no way they are going to create something major around it. Anyone clamoring for a Casey Jr ride needs to ask themselves who the heck even knows that character? Until I started frequenting these boards, I sure as heck didn't.
A Casey Jr. quick service spot, on the other hand, makes perfect sense. It's something that no one really needs to understand but fits in with the Dumbo theme and is a nice nod to the Disney fanatic who will likely wet their pants about it and then go buy more DVC points or book a Disney cruise while ramming a Dole Whip in their face.
I'm sorry you have no interest in Dumbo and Pinocchio because they are two of the greatest films ever made, IMO (not just among animated films, but ANY films!) And despite how they may at times be marketed, they are FAR from "kiddie films", and watching the "Making Ofs" and listening to the commentary tracks on their DVDs clearly illustrates this. I give them both my HIGHEST recommendation!
Just because you apparently aren't a big Disney animation fan, a lot of people know and love these characters, even in the mainstream! (especially children and the young at heart, who are among the biggest fans of Fantasyland.)
Pinocchio was released on DVD and BD as recently as 2009 as part of Walt Disney Studios Home Entertainment's "Platinum Edition" series, and it sold well. The Platinum series consisted of the 13 Animated Classics that were chosen for the product line by virtue of being the 13 biggest sellers on home video among the animated classics. Other Disney Animated Classics (DAC's) released as part of that line were (in order of original theatrical release) Snow White and the Seven Dwarfs, Pinocchio, Bambi, Cinderella, Peter Pan, Lady and the Tramp, Sleeping Beauty, 101 Dalmatians, The Jungle Book, The Little Mermaid, Beauty and the Beast, Aladdin, and The Kion King.
So I think you underestimate the impact and awareness of Pinocchio, including among the general public!
As for Casey Junior, his film,
Dumbo, has always been a strong seller on home video as well, and narrowly missed being a part of the Platinums. Dumbo is being re-released in the US on DVD and BD in 2011 (it's already out in most of the world), which would be perfect timing for awareness of the characters from that film to be peaking when the FLE opens - even among children and their families who are more "mainstream" and less "hardcore" in their Disney knowledge!