i didn't know this was the reason, i thought it had to do with eisners control and with him pissing off everyone?
Way back when they were making the original movie, they wanted cartoon characters from Warners as well as there own Disney characters. WB said no way. Disney contacted Speilberg, told him what was planned and Speilberg basically went to WB and using his clout told them to do it. Since he, and a couple others, were the ones responsible, they got a cut of the take from the movie. Steven Speilberg owns half interest in the Roger Rabbit Character. Therefore, every time Roger makes an appearance at any Disney Theme Park, Spielberg gets his two cents worth. Disney got tired of doing this. He wanted more. Etc, etc. That's the main reason there has been no sequel to the movie. Everybody wants their 2 cents and Disney doesn't like sharing. So, for the foreseeable future, no more Roger Rabbit charaters at Disney Theme Parks. I miss him too.