This will never happen and they will continue the support of slaughtering every animal to extinction.
The Chinese have very persuasive way to stop behaviors... If they decide to do so. Furthermore by releasing the already harvest ivory progressively during 100 years the supply will there, for those ready to spend it (open bidding) while supporting preservation. You know elephants and rhinos die too... What is the problem with taking ivory from naturally dead animals? There is no contradiction between sustainablilty of the ivory trade and preservation of those animals living condition.