treefit, no, I don't think visionOS will replace macOS. It feels like Apple themselves aren't sure what their Vision Pro product line is for. They just put it out as a technology demonstrator and to see what third-party developers will come up with. It's entirely possible that VR is a solution in search of a problem for anything but games.
BTW the notarization aren't even a strict requirement. You can still distribute macOS apps without any Apple involvement, it's just that the UX of the first launch of such an app won't be great.
@grishka @treefit visionOS, at least so far, is just a vanity project for Cook