I suspect in the near future devices sold in China will be unable to install certain apps (similar to how Apple recently removed Taiwan's national flag for all Macs sold in China with its latest update -
https://mobile.twitter.com/jeremyburge/status/11109235618820...), foreign browsers will stop working (and be forced to implement support for this functionality to the extent that the Chinese government can not only block specific pages on https (as we see here) but also replace the individual page with their own content).. This will make it very easy for China to not only censor the internet, but also to rewrite history completely. Replace the Wikipedia article related to the Tienanmen massacre with their own, replace Googles search results with their own, etc.
To make matters even more scary, they'll put great emphasis on promoting their own browsers in foreign countries, force hardware vendors to preinstall their browsers on devices sold outside China. Forget about the Chinese Firewall, this will take censorship and rewritten history to a whole new level that will affect people all over the world, and make it much much easier to affect foreign policies and elections.
Now for the sad part, even after they've showed their cards, companies and governments will still continue to invest in China, continue to bend over and do whatever they ask for.