Prudent, yes. But are all of those private aviation? Doesn't commercial civilian and military aviation include any VFR flights? Some of them also sound like emergency/rescue operations.

Nothing will actually stop those VFR flights from still happening, they'll just be less convenient/safe without certain ATC services. If those services are truly required, they can do IFR instead. So can private pilots just flying for fun for that matter, assuming the pilot has the right rating.