Given the strong guarantees of Fed independence and inflation-targeting written into its establishing laws, I think the hyperinflation case you're worried about boils down to a collapse of the American political system or its defeat in a much more major war than it's been involved in for many decades. This is a risk to think about and plan for, but not at the cost of exposing yourself to the risks of storing your wealth in such a volatile commodity as bitcoin. Stock up on living needs and stable commodities if that possibility seems realistic to you, and be ready to use bitcoin as a medium of exchange.