I don't see the 'tacit acceptance of the legal system' fading away because of the internet. That sounds very 1996. There will always be a 'state' of some kind, in the sense of a monopoly on the forces of coercion. Your life can become as virtual as you like, but there will always be physical police who can knock on your door.
In general though, the state will fade from relevance as you say -- but not to the point of 'obsolescence'.
We have learned a lot. Today, people die from obesity instead of sword wounds.