~snip~
Almost Bitcoin is spread all over world. It's trend will rise day by day and some country allow Bitcoin for online shopping just like a debit card. But on other hand, cryptocurrency ban in some country and it is restricted to use cryptocurrency.
I think it's a good point that Bitcoin is already being held all around the world, so it's already pretty much ready to become universally accepted.
I mean, companies like Strike already assume this, they want to create a service that exchanges fiat1 with fiat2 by sending the bitcoin equivalent from fiatland1 to fiatland2. Since they can easily buy and sell Bitcoin in both countries, they can provide this service.
I personally don't see the point of saving in fiat instead of Bitcoin though.