I think probably paper could disapear, but it will be replace by handwriting in digital devices. I have replaced my notebooks by the kit iPad+Goodnotes+Apple Pencil. The experience is very similar and it has some advantages. I still prefer physical books to read, but as new generations start to read school books on iPads, this will be the end of physical books. So I think paper as default support for books will be replaced, but handwriting will be present in digital devices.