This seems like one of those scenarios where you find out Disney did make a Roger Rabbit sequel, but they never marketed it, or it had a limited release in 12 California cinemas, and it only existed as a pro forma device to show they still controlled the character and would have the option to make sequels for another 35 years.

Bonus if it randomly starred or was directed by someone who later became famous, or if there are blog posts calling it an unknown masterpiece.

Nice to hear that didn't happen in this case and the author gets a second chance!