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.
We will definitely need some form of physical money for a long time but I really hope that people finally understand the scam that fiat really is and decide to no longer accept pieces of paper with no value in exchange for their time and energy that do have value and that the governments are stealing every day by just printing more and more currency, but I doubt I will get to live to see that day since people are very easy to manipulate.