If re-metalisation of exchange is looked at in isolation, then its typically about a Level Two in Dmitry Orlov's model of de-complexification.

Bitcoin's concurrent use beside fiat could lubricate the change and keep it to a Level One, even.

But I don't see The Powers That Be handing over the levers with a smile and best wishes for our future. They can force it to be a Level Three easily enough, and a Level Four in places.