I certainly agree that DuckTales works as a universal IP. It’s a brief off shoot from Mickey Mouse, with Donald Duck. Scrooge and the Boys are also part of the Mickey Universe. You also have access to Ludwig Von Drake, who came from Wonderful World of Color (the offshoot of the Disneyland show).
I don’t think they want to spend it on Splash.
The problem with Ducktales is that music isn’t an important factor. Which I think should be important on any Splash replacement.