If the WTS keeps hiding cases of child abuse, they'll soon find themselves in the same position as the Catholic Church. Once that happens, many JWs will think twice about going door to door. Think about it, would you get up early in the morning only to be accused of hiding perverts at the KH?
Just as the WTS had a mass exodus in 1975 over an unfulfilled prophecy, another exodus will soon take place as a result of the child abuse crisis. Keep in mind, that in both cases, they created the problem for themselves. They can't blame the world, or Satan.