The more advanced civilization certainly increasingly converge all forms of payment including the currency. I believe, after the unification of European currencies, it will be overtaken by other regions and would eventually be a single currency. And bitcoin had the opportunity to become a global currency.
You know time is running and the public will be more advanced and of course people will use age appropriate technology as well as the currency, I'm sure they will start using bitcoin in the future
It could happen but not all has the capacity to understand how to use bitcoin, it's pretty complicated for simple user who are not actively transacting online. It will become a global currency but never expect that majority of the worlds population will adopt. It will be only be dominant online, but will not affect the physical world offline transaction.