Everyone can do whatever he wants with his own money, now you are thinking in a world that using bitcoin for everything an this is not possible at the moent (due the limit of 7 tx per second, the lenght of confirmation, etc). As I always say here, bitcoin is a good and functional alternative to send money from a point A (example Rome) to a point B (example Pechino) with the lowest fee in the world (respect WU, moneygram, etc...) it could be also used for save money; the mainstream adoption will never happen with this protocol condition and bitcoin can never replace FIAT.

just my personal opinion, thanks for the attention.

PS: I always hoped in a decentralized world, but until the governments will exist that "thing" will never happen.