You can order everything via the internet and use bitcoin for that, its possible in many places
You can just as easily use a Bitcoin payment card to buy things offline, in the nearby shopping mall behind the corner
I got bad news for you, FIAT is already worthless outside its artifical use for government taxes. What happens in some cases is the government pays out the countries money to add value to its currency, every time anyone uses this money it costs every citizen and is a tax on society but thats true of government in general. The country where this is true is USA and many others where inflation has increased so much that the production cost to their notes or coins has exceeded any worth attributed. I read the reason USA doesnt scrap or revise their money is the cotton cost is given to its own farmers, so its a form of subsidy support to voters
I'm inclined to disagree with such point of view. Conceptually, any money is worth exactly the quantity of goods that you can buy with it and the volume of services that can be rendered to you for it. Whether it is due to taxes or thanks to God's will is ultimately irrelevant. You can't possible escape from this. If you meant to say that fiat is worthless as such because it doesn't have any intrinsic value on its own (besides transactional utility, of course), then I have a bad news for you too...
Namely, that Bitcoin is as worthless as any other (fiat) money out there
