I Believe someday were not going to use cash anymore. But that doesnt mean its bitcoins fault. Most of Us now wants Easy Access to their Money. They want to buy something without bringing a real cash with them. Because theyre afraid of being robbed. And because of Innovative Technology that we have now, transactions are always made through the Internet. I believe a few years later from now. There will be a cashless society where nobody needs money anymore. So its possible for the cash to disappear sooner or later.
Yeah it is possible but it is not necessary for cash to be extinct. Using digital money may be convenient and has faster transactions but still we need paper money. Imagine in the future if the internet connection is cut off or shut down due to big reasons. We know that cryptos need internet to function, it will be better to have paper money for back up.