It is rare for a studio to pull out of a planned trilogy in midstream, but the number-crunching showed a franchise on a downward trend. "Lion" roared to $292 million domestically and another $453 million internationally in 2005. This year, "Prince Caspian" grossed a healthy $141 million in North America and another $278 million internationally, but that was well off the "Lion" take....explains THIS piece at Hollywood Reporter. Walden Media is now free to pursue other co-financing/producing/releasing avenues.