lol, this is comical from the perspective of someone who has lived through the death of a fiat currency, twice. Americans think the dollar will never die. To that I say:
Sure, maybe the USD is truly immortal, unlike every other global reserve currency before. But imagine waking up one day and they printed so much money that your $120 million USD can barely buy you bread (aka soft default). Oh, and you can't buy Bitcoin either because they have blocked off the exits in anticipation of this.
Alternatively, imagine waking up one day and seeing everyone's bank accounts frozen, the funds are then confiscated in a "bail in." Your $120 million USD is now theirs. After much public outcry and burning and looting, they give you back your money in a new currency they just printed, worth 10% of your original purchasing power. Meanwhile, you have no Bitcoin because you sold it all!
Moral of the story, fiat is as meaningless as toilet paper. Good luck living your "stress free" life in fiat land! I know what I will be doing.