I am not believe in fiat/paper money anymore becouse I know if we use fiat our economy can crash only in few day like what happen in asean at 1997.
So what are you using to buy your families grocery, for paying your utility bills and for paying everything you want to purchase. Don't tell me that you are using bitcoin for all of that because we know that there are still a lot of stores that are not yet accepting bitcoin. Because we don't have choice but to keep on believing and using fiat.
You are uninformed at best and misinformed at worst
If you order one of the numerous Bitcoin payment cards, you can use it pretty much in the same way you use fiat money. That is, to buy your groceries, pay your utility bills or purchase anything you may ever want to purchase. So I have no other option but to tell you exactly that, namely, that you do have choice whether to keep on using fiat or switch bitcoins. Though it may just not make much sense to spend your precious bitcoins on everyday expenses, but this is another story
That stands true in first world countries but in most places in third world countries, it's quite hard to use your credit card/bitcoin card/ATM card to buy stuffs. Fiat is still the one that you should use (there's no other option). I'm talking about places that do not have malls. It's usually just places in the city and in malls that accepts payment directly from your card. I've also seen people (from movies) using their smartphone + some additional device to swipe your card. I've never seen anything like that in my place, honestly.
But what difference does it make?
In such places any payment card will be utterly useless, not just a Bitcoin one, so the point is moot on the whole. On the other hand, though, even in such godforsaken corners of the world you can still use physical bitcoins (here I refer, for example, to
OpenDime devices), at least, as long as you can check the wallet balance somehow (or you just happen to trust the guy who pays you with them and vice versa)