The day they do that, Android will just be a Chinese product and Google will lose control over it.
Huawei took control of its own destiny instead of relying on Google forks.
https://developer.huawei.com/consumer/en/design/
https://developer.huawei.com/consumer/en/harmonyos/develop/
Indeed and if Google would pull the plug on AOSP, some initiative like this would become the de facto Android standard.
I doubt that people advocating for GrapheneOS would pivot to a Chinese powered platform.
They would have to follow like everybody else, they aren't powerful enough to dictate market trends.
8 out of the top 10 Android manufacturers are Chinese.
Google would just lose the ownership of Android to a Chinese consortium used by everybody else.