You don't understand the licensing agreements. Let me give you an example.
If I am running a day care center and I want to paint Mickey Mouse on my business front door, I need permission from Disney to do that. I will have to pay a licensing fee to Disney for the privilege of using Mickey and any of his friends on my business. Disney is extremely strict about the control and use of their IP.
As for the Seven Dwarfs, as long as I don't use the Disney names (i.e. Happy, Dopey, etc.) or use the Disney cartoon drawings of the dwarfs, then I can use either my own depictions of the dwarfs or the drawings from the Brothers Grimm.
For your information the clock is ticking on Mickey because his copyright is running out. That's the major reason why Mickey is the trademark of TWDC. As long as they use Mickey as a trademark he's protected.
And contrary to your assertion that "no character in Fantasyland whose status in the Public Domain is an issue for Disney", you have overlooked the fact that Disney has a huge legal department that spends a lot of time and money on protecting their IP. Here a recent article concerning "Disney's Snow White":
http://www.bloomberg.com/news/artic...nd-rights-as-snow-white-appears-at-wanda-park
And the clock is ticking on "Disney's Snow White" as well, as opposed to "Public Domain Snow White". The bottom line is that it's up to the courts to decide what is and is not copyright infringement. Disney IP is the heart and soul of the company which is the reason why they lobbied so hard to have The Mickey Mouse Protection Act passed by Congress.