How about something original which speaks to the same types of messages as Circle of Life. Maybe an original animtaed character that is created just for this movie that can speak to the needs for recycling to protect the existing resources. Maybe something that would show how paper is recycled and the trees that it could save? Hosted by an original character as our guide.
I think it's important that the theme is kept in that theater to really drive home the overall theme of the pavilion, but at the same time I do believe that there must be an element that makes it accesible (and educational) for the young kids, because the rest of the pavilion does not reach that crowd.