The present generation is completely technology adaptive, and as a part of development there were more altcoins getting into the global market. It'll get used by more and more people as the need for technology too have grown in large scale. However the growth might be, the usage of physical currencies will last forever.
right, the use of real currency will certainly continue, because the currency can be controlled by the central bank, in contrast to cryptocurrency, which is not owned by one country
fiat currency will not ever replaceable by any digital currency and cryptocurrency involved.but as alternative payment it could used as investment portofolio and payment in global trades.