While the score of the '58 version of Flower Drum Song is generally considered to be very good, the book has long been regarded as patronizing and/or condescending to Asian Americans. It's rarely done in regional theatre. In fact, I've never seen a production.
I may be totally wrong, but I took lowriter's post to mean that many Asian actors may not want to be involved in a revival of the original version. In addition, given Encores poor record at casting Asian actors in the past, they might have difficulty finding enough performers for a show that may require a cast of around 45.