Meteoric national growth curves don’t continue; and the closed nature of these societies tends to mean they get hamstrung by unpredictable things in the future. No one can say why China’s growth will slow (and it already is slowing dramatically), but we can say for sure that it will be because of a lack of willingness to change.
Learning Chinese will be a worthwhile activity for leading Western businesspeople when the Communist Party is abolished or faces strong open competition for power.