Well, if you have a national ID, it's a lot easier to require ID when taking public transit (especially if they have RFID tags: "wave your ID to activate the ticket kiosk!"). That is certainly a step towards, while not necessarily totalitarianism, the sort of police state which I doubt that anyone would want to live in.
The problem isn't that national IDs will cause totalitarianism; they won't. The problem is that they're a step in a direction which a lot of people dislike, towards a government which is monitoring everything we do.