You say that people who use degoogled phones will be unaffected by this measure and downplayed the impact those measures will have on them. My point is that they will be hurt by it regardless.

If Google makes side loading of apps impossible unless you have a degoogled phone, projects that need side loading to function like F-Droid and other open source apps that do things Google doesn't like will see their already small user base collapse to only the niche audience that has a degoogled phone. I don't expect those projects and apps to maintain the level of support they currently have if it is for such a reduced audience.

As a bare minimum it is a blatant attempt by Google to gain even more control over the entire Android ecosystem and I would absolutely not say that we should wait and see where this is going like you did.