Paper notebooks.
I am not as optimistic as mrcharly-YHT; I don't think they will be gone completely. Sorry.
Twenty years ago, 'the paperless office' was a really popular concept. Everyone laughed, while trying to find space on their desk for teetering piles of A4.
I worked from home, for 18 month, without access to a printer. Didn't disrupt my work one bit.
Paper, apart from a medium for art, will pass.
It has taken remarkably little time for E-tickets to become commonplace. A bit over a decade of smartphones has achieved that. In another 10 years?
Paper will cease being part of everyday life, apart from something you use to wipe your arse (and not even then, if someone can work out how to use the 3 shells).