I simply want to remind everyone that Bitcoin is not a magic that fights inflation. I'll tell you how the price goes up, to be sure that it's not some sort of magic. When you invest, when I invest, when millions of people invest in a small, limited pool (I mean 21 Million supply), the price goes up but once we start cashing out, the price will go down. The one who cash outs Bitcoin, is the winner.
If the USA invests in Bitcoin in order to repay its debt, this is what will happen in reality. The USA invests in Bitcoin, millions of people also invest in Bitcoin, some other countries invest in Bitcoin. Now there is a big pool of money, the USA decides to cash out Bitcoins and receive fiat, the price will significantly fall but the USA will receive its money. Do you wanna know what happened in reality? The USA took your money, the money that you invested. People can do the same if they cash out before the USA cash outs.
So, I want to say that Bitcoin won't automatically fight inflation, it's impossible. When there is a winner, there is a loser, that's the balance in nature.
I agree with you, albeit, it will be done in such a way that the price won't be going that low on a whim of the US and others - it will be done with regulations intact, so that BTC won't become something that is just manipulated by the fingers of those big guys in the suits

But, surely - as time goes on, more and more big influential people with the bags ready are seeing what BTC may give them - stability and prosperity.