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.
the usage of normal money will not be able to denied at any period of time because it will be the accessof any country so the country will not be affected through the acceptance of cryptocurrency but using normal currency will reduce the development of economic situation of a country also.