Hard to know. Maybe both of them will exist in the future. There are still many people can not access the computer or technology which allow them to use the digital money
Well when all people all over the world will adopt how to used digital money i am definitely sure that it has a big chance that the cash or the paper money will dissapear in this world, but i think cash will still stay in this world for long time because until now not all people is supporting digital money.