The entire thing with bitcoin that I don't get is that the owner's need to trade it for fiat currency at the end. So long as fiat currency is part of the play

The entire thing with bitcoin that I don't get is that the owner's need to trade it for fiat currency at the end. So long as fiat currency is part of the play I don't see the value. It needs to exist without fiat currency. Govts and the central banks around the world have no power without being fiat, they need to be able to print as much as they can, and they demand for taxes in fiat. So you will eventually have to sell your bitcoin even if you most of your transactions in it, you will need to sell some and buy money to pay taxes. The Feds "saved the economy" with the massive QE, Trillion dollars stimulus. What could they have done if currency was all bitcoin?