I don't really like the idea of a general Disney (platform) fighter - not because of corporate woes or uneasiness about Darth Vader beating up Pooh, but because "Disney" is such a vague starting point all things considered and as such even an Ultimate-sized roster would likely be super safe and predictable while also leaving out some super important characters. I think it'd be best to restrict it somehow - the new Disney Speedstorm is focusing entirely on the animated canon, certain live action IPs, and Pixar which I think is a good way to go, but personally I'd want a Disney fighter to be based on a single IP that isn't star wars or marvel - The Simpsons, The Muppets, The Incredibles, Toy Story, The Lion King, Lilo & Stitch, Futurama, I can easily imagine fighting game rosters based on all these IPs without any need for guest content.