If that happens I’d be extremely surprised. They have been really against truly modularizing Windows because of the lack of documentation partly due to the push of “agile” methodologies mixing with top down feature pushes and the effort required to create something that would support Windows applications in a way that users would understand. There are also just too many applications out there that use too many features in unintended ways, including or especially their own.
I don’t get the logic of cutting off contributions of any kind unless they were actively sabotaging the projector something. Seems like that just makes the fork basically a guarantee. And in open source, a fork that discourages community is always going to be at a disadvantage.