Regardless of the church you subscribe to (deflationary spiral of death VS austrian hard money libertopia), the fact remains that people:
- want to save value for later,
- want it to be liquid,
- want it to be secure
Govs' monopoly on money and ad-hoc issuance policy does not make fiat currencies a good fit. Physical gold is hard to secure, transport and partially liquidate. Gold certs and all sorts of funds are subject to counterparty risk that we begin with (see the history full of abuses in that realm). Real estate is expensive, comes with high taxes and is very far from being liquid.
Bitcoin solves all these issues because it's far more liquid and easier to secure than gold or real estate. That creates a leverage against how much gov could inflate their money supply or tax other assets: they more they do, the more value flows out into Bitcoin. Today Bitcoin is a tiny slice of the pie, but in the future it may be very visible and offer real competition and make all the people who do not even use Bitcoin find themselves in a more stable fiat environment as a result.