So with regards to Aladdin, Disney owns everything, which means that they can legally get away with paying Rossio basically nothing. Aladdin and The Lion King are two of the most iconic films in the history of animation, and that's mostly because the filmmakers didn't phone it in. Here:
This was a labor of love by storyboard artist Jorgen Klubien, for which he was rewarded with a writing credit ... a credit the remake is taking away from him, even though it lifts his work verbatim. The Aladdin remake also reuses the rhyme that the Cave of Wonders yells at Jafar, which Rossio wrote.
And that's probably what made the live-action remakes an attractive prospect to begin with ... maybe even moreso than the guaranteed returns they'd see from millennials seeking a nostalgia high.