The UN and a world government “constitution” doesn't (and won't) have a First Amendment so they can regulate all communication with impunity.
This is all right around the corner — controlling the hearts and the minds of the masses on a global scale.
Unfortunately, we would not feel the affects immediately. If it were a sudden jolt to communications we could at least see the problem.
We will be eased into it until we end up policing each other — ‘Don’t tick them off! Don’t say that. I don’t care if it’s the truth.’
It goes downhill from there.