I experienced that feeding someone his own poison is often the best medicine. Providers world wide should block email access to all China based email for a month or two. Would be a picture for the gods having the Chinese executives and CEOs abroad cut off from their email and crying "foul!" "foul!".
This being said, the Chinese are pretty good in what they are doing. What will it buy them in the long run? Even big Chinese companies in China use VPN to access the internet. The final result will be that China won't have internet but something like an intranet. Good luck with that!