What happens? (If, because again, that's not what has happened, so far.)
- GrapheneOS would continue, but probably not manage compatibility with the next Pixel phone.
- Various forks of Android Open Source get created, with mixed success. Existing phones will keep working, new phones with proprietary servers drivers are much less likely to work.
- We create something like
ndiswrapper
to help us extract weird new phone hardware drivers and make them work with open operating systems. - The fully open phone hardware projects suddenly get a bunch of new customers.
The last point is the only thing I'm confident is preventing Google from taking their fork of AOSP fully closed. (Yes, I know it wouldn't be legal. But I'm not sure their lawyers think they would be held accountable. Most people don't understand the existing laws Google already breaks daily since purchasing YouTube.)